diff --git a/core/Cargo.toml b/core/Cargo.toml
index d14fc9bf..6141dd87 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -29,6 +29,7 @@ serde.workspace = true
 reqwest = { version = "0.12.5", default-features = false, features = ["json", "rustls-tls"] }
 js-sys = "0.3.67"
 thiserror = "1.0.63"
+jisx0401 = "0.1.0-beta.2"
 
 [dev-dependencies]
 tokio.workspace = true
diff --git a/core/src/domain/chimei_ruiju/entity.rs b/core/src/domain/chimei_ruiju/entity.rs
index 1bc4e184..1d793d27 100644
--- a/core/src/domain/chimei_ruiju/entity.rs
+++ b/core/src/domain/chimei_ruiju/entity.rs
@@ -13,9 +13,9 @@ pub struct PrefectureMaster {
 #[derive(Deserialize, Debug)]
 pub struct CityMaster {
     /// 市区町村名
-    name: String,
+    pub(crate) name: String,
     /// 町名リスト
-    towns: Vec<String>,
+    pub(crate) towns: Vec<String>,
     /// 緯度経度
     coordinate: Coordinate,
 }
@@ -23,7 +23,7 @@ pub struct CityMaster {
 #[derive(Deserialize, Debug)]
 pub struct TownMaster {
     /// 町名
-    name: String,
+    pub(crate) name: String,
     /// 街区リスト
     blocks: Vec<Block>,
     /// 緯度経度
diff --git a/core/src/repository.rs b/core/src/repository.rs
index bb3a487a..9df7829d 100644
--- a/core/src/repository.rs
+++ b/core/src/repository.rs
@@ -1 +1,2 @@
+pub mod chimei_ruiju;
 pub mod geolonia;
diff --git a/core/src/repository/chimei_ruiju.rs b/core/src/repository/chimei_ruiju.rs
new file mode 100644
index 00000000..5c4bae46
--- /dev/null
+++ b/core/src/repository/chimei_ruiju.rs
@@ -0,0 +1,3 @@
+pub mod city;
+pub mod prefecture;
+mod town;
diff --git a/core/src/repository/chimei_ruiju/city.rs b/core/src/repository/chimei_ruiju/city.rs
new file mode 100644
index 00000000..2d09d70a
--- /dev/null
+++ b/core/src/repository/chimei_ruiju/city.rs
@@ -0,0 +1,138 @@
+use crate::domain::chimei_ruiju::entity::CityMaster;
+use crate::domain::chimei_ruiju::error::ApiError;
+use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+use jisx0401::Prefecture;
+
+pub struct CityMasterRepository {
+    api_service: ChimeiRuijuApiService,
+}
+
+impl CityMasterRepository {
+    pub async fn get(
+        &self,
+        prefecture: &Prefecture,
+        city_name: &str,
+    ) -> Result<CityMaster, ApiError> {
+        let url = format!(
+            "https://{}.chimei-ruiju.org/{}/master.json",
+            prefecture.name_en(),
+            city_name
+        );
+        self.api_service.get::<CityMaster>(&url).await
+    }
+}
+
+#[cfg(test)]
+mod async_tests {
+    use crate::repository::chimei_ruiju::city::CityMasterRepository;
+    use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+    use jisx0401::Prefecture;
+
+    #[tokio::test]
+    async fn 神奈川県愛甲郡清川村() {
+        let repository = CityMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get(&Prefecture::KANAGAWA, "愛甲郡清川村").await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "愛甲郡清川村");
+        assert_eq!(entity.towns, vec!["煤ヶ谷", "宮ヶ瀬"]);
+    }
+
+    #[tokio::test]
+    async fn 京都府乙訓郡大山崎町() {
+        let repository = CityMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get(&Prefecture::KYOTO, "乙訓郡大山崎町").await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "乙訓郡大山崎町");
+        assert_eq!(entity.towns, vec!["字円明寺", "字大山崎", "字下植野"]);
+    }
+}
+
+#[cfg(feature = "blocking")]
+impl CityMasterRepository {
+    pub fn get_blocking(
+        &self,
+        prefecture: &Prefecture,
+        city_name: &str,
+    ) -> Result<CityMaster, ApiError> {
+        let url = format!(
+            "https://{}.chimei-ruiju.org/{}/master.json",
+            prefecture.name_en(),
+            city_name
+        );
+        self.api_service.get_blocking::<CityMaster>(&url)
+    }
+}
+
+#[cfg(all(test, feature = "blocking"))]
+mod blocking_tests {
+    use crate::repository::chimei_ruiju::city::CityMasterRepository;
+    use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+    use jisx0401::Prefecture;
+
+    #[test]
+    fn 埼玉県比企郡嵐山町() {
+        let repository = CityMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get_blocking(&Prefecture::SAITAMA, "比企郡嵐山町");
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "比企郡嵐山町");
+        assert_eq!(
+            entity.towns,
+            vec![
+                "むさし台一丁目",
+                "むさし台二丁目",
+                "むさし台三丁目",
+                "大字根岸",
+                "大字勝田",
+                "大字太郎丸",
+                "大字川島",
+                "花見台",
+                "大字遠山",
+                "大字大蔵",
+                "大字菅谷",
+                "大字千手堂",
+                "大字廣野",
+                "大字杉山",
+                "大字平澤",
+                "大字将軍澤",
+                "大字志賀",
+                "大字吉田",
+                "大字古里",
+                "大字越畑",
+                "大字鎌形"
+            ]
+        );
+    }
+
+    #[test]
+    fn 岐阜県不破郡関ケ原町() {
+        let repository = CityMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get_blocking(&Prefecture::GIFU, "不破郡関ケ原町");
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "不破郡関ケ原町");
+        assert_eq!(
+            entity.towns,
+            vec![
+                "大字今須",
+                "大字大高",
+                "大字関ケ原",
+                "大字玉",
+                "大字藤下",
+                "大字野上",
+                "大字松尾",
+                "大字山中"
+            ]
+        );
+    }
+}
diff --git a/core/src/repository/chimei_ruiju/prefecture.rs b/core/src/repository/chimei_ruiju/prefecture.rs
new file mode 100644
index 00000000..702cb0d9
--- /dev/null
+++ b/core/src/repository/chimei_ruiju/prefecture.rs
@@ -0,0 +1,238 @@
+use crate::domain::chimei_ruiju::entity::PrefectureMaster;
+use crate::domain::chimei_ruiju::error::ApiError;
+use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+use jisx0401::Prefecture;
+
+pub struct PrefectureMasterRepository {
+    api_service: ChimeiRuijuApiService,
+}
+
+impl PrefectureMasterRepository {
+    pub async fn get(&self, prefecture: &Prefecture) -> Result<PrefectureMaster, ApiError> {
+        let url = format!(
+            "https://{}.chimei-ruiju.org/master.json",
+            prefecture.name_en()
+        );
+        self.api_service.get::<PrefectureMaster>(&url).await
+    }
+}
+
+#[cfg(test)]
+mod async_tests {
+    use crate::repository::chimei_ruiju::prefecture::PrefectureMasterRepository;
+    use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+    use jisx0401::Prefecture;
+
+    #[tokio::test]
+    async fn 東京都() {
+        let repository = PrefectureMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get(&Prefecture::TOKYO).await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "東京都");
+        assert_eq!(
+            entity.cities,
+            vec![
+                "千代田区",
+                "中央区",
+                "港区",
+                "新宿区",
+                "文京区",
+                "台東区",
+                "墨田区",
+                "江東区",
+                "品川区",
+                "目黒区",
+                "大田区",
+                "世田谷区",
+                "渋谷区",
+                "中野区",
+                "杉並区",
+                "豊島区",
+                "北区",
+                "荒川区",
+                "板橋区",
+                "練馬区",
+                "足立区",
+                "葛飾区",
+                "江戸川区",
+                "八王子市",
+                "立川市",
+                "武蔵野市",
+                "三鷹市",
+                "青梅市",
+                "府中市",
+                "昭島市",
+                "調布市",
+                "町田市",
+                "小金井市",
+                "小平市",
+                "日野市",
+                "東村山市",
+                "国分寺市",
+                "国立市",
+                "福生市",
+                "狛江市",
+                "東大和市",
+                "清瀬市",
+                "東久留米市",
+                "武蔵村山市",
+                "多摩市",
+                "稲城市",
+                "羽村市",
+                "あきる野市",
+                "西東京市",
+                "西多摩郡瑞穂町",
+                "西多摩郡日の出町",
+                "西多摩郡檜原村",
+                "西多摩郡奥多摩町",
+                "大島町",
+                "利島村",
+                "新島村",
+                "神津島村",
+                "三宅村",
+                "御蔵島村",
+                "八丈町",
+                "青ヶ島村",
+                "小笠原村",
+            ]
+        )
+    }
+
+    #[tokio::test]
+    async fn 富山県() {
+        let repository = PrefectureMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get(&Prefecture::TOYAMA).await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "富山県");
+        assert_eq!(
+            entity.cities,
+            vec![
+                "富山市",
+                "高岡市",
+                "魚津市",
+                "氷見市",
+                "滑川市",
+                "黒部市",
+                "砺波市",
+                "小矢部市",
+                "南砺市",
+                "射水市",
+                "中新川郡舟橋村",
+                "中新川郡上市町",
+                "中新川郡立山町",
+                "下新川郡入善町",
+                "下新川郡朝日町",
+            ]
+        );
+    }
+}
+
+#[cfg(feature = "blocking")]
+impl PrefectureMasterRepository {
+    pub fn get_blocking(&self, prefecture: Prefecture) -> Result<PrefectureMaster, ApiError> {
+        let url = format!(
+            "https://{}.chimei-ruiju.org/master.json",
+            prefecture.name_en()
+        );
+        self.api_service.get_blocking::<PrefectureMaster>(&url)
+    }
+}
+
+#[cfg(all(test, feature = "blocking"))]
+mod blocking_tests {
+    use crate::repository::chimei_ruiju::prefecture::PrefectureMasterRepository;
+    use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+    use jisx0401::Prefecture;
+
+    #[tokio::test]
+    async fn 高知県() {
+        let repository = PrefectureMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get(&Prefecture::KOCHI).await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "高知県");
+        assert_eq!(
+            entity.cities,
+            vec![
+                "高知市",
+                "室戸市",
+                "安芸市",
+                "南国市",
+                "土佐市",
+                "須崎市",
+                "宿毛市",
+                "土佐清水市",
+                "四万十市",
+                "香南市",
+                "香美市",
+                "安芸郡東洋町",
+                "安芸郡奈半利町",
+                "安芸郡田野町",
+                "安芸郡安田町",
+                "安芸郡北川村",
+                "安芸郡馬路村",
+                "安芸郡芸西村",
+                "長岡郡本山町",
+                "長岡郡大豊町",
+                "土佐郡土佐町",
+                "土佐郡大川村",
+                "吾川郡いの町",
+                "吾川郡仁淀川町",
+                "高岡郡中土佐町",
+                "高岡郡佐川町",
+                "高岡郡越知町",
+                "高岡郡檮原町",
+                "高岡郡日高村",
+                "高岡郡津野町",
+                "高岡郡四万十町",
+                "幡多郡大月町",
+                "幡多郡三原村",
+                "幡多郡黒潮町"
+            ]
+        )
+    }
+
+    #[tokio::test]
+    async fn 佐賀県() {
+        let repository = PrefectureMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get(&Prefecture::SAGA).await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "佐賀県");
+        assert_eq!(
+            entity.cities,
+            vec![
+                "佐賀市",
+                "唐津市",
+                "鳥栖市",
+                "多久市",
+                "伊万里市",
+                "武雄市",
+                "鹿島市",
+                "小城市",
+                "嬉野市",
+                "神埼市",
+                "神埼郡吉野ヶ里町",
+                "三養基郡基山町",
+                "三養基郡上峰町",
+                "三養基郡みやき町",
+                "東松浦郡玄海町",
+                "西松浦郡有田町",
+                "杵島郡大町町",
+                "杵島郡江北町",
+                "杵島郡白石町",
+                "藤津郡太良町"
+            ]
+        );
+    }
+}
diff --git a/core/src/repository/chimei_ruiju/town.rs b/core/src/repository/chimei_ruiju/town.rs
new file mode 100644
index 00000000..71b09122
--- /dev/null
+++ b/core/src/repository/chimei_ruiju/town.rs
@@ -0,0 +1,82 @@
+use crate::domain::chimei_ruiju::entity::TownMaster;
+use crate::domain::chimei_ruiju::error::ApiError;
+use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+use jisx0401::Prefecture;
+
+#[allow(dead_code)]
+pub struct TownMasterRepository {
+    api_service: ChimeiRuijuApiService,
+}
+
+impl TownMasterRepository {
+    pub async fn get(
+        &self,
+        prefecture: &Prefecture,
+        city_name: &str,
+        town_name: &str,
+    ) -> Result<TownMaster, ApiError> {
+        let url = format!(
+            "https://{}.chimei-ruiju.org/{}/{}/master.json",
+            prefecture.name_en(),
+            city_name,
+            town_name
+        );
+        self.api_service.get::<TownMaster>(&url).await
+    }
+}
+
+#[cfg(test)]
+mod async_tests {
+    use crate::repository::chimei_ruiju::town::TownMasterRepository;
+    use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+    use jisx0401::Prefecture;
+
+    #[tokio::test]
+    async fn 東京都千代田区千代田() {
+        let repository = TownMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository
+            .get(&Prefecture::TOKYO, "千代田区", "千代田")
+            .await;
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "千代田");
+    }
+}
+
+#[cfg(feature = "blocking")]
+impl TownMasterRepository {
+    pub fn get_blocking(
+        &self,
+        prefecture: &Prefecture,
+        city_name: &str,
+        town_name: &str,
+    ) -> Result<TownMaster, ApiError> {
+        let url = format!(
+            "https://{}.chimei-ruiju.org/{}/{}/master.json",
+            prefecture.name_en(),
+            city_name,
+            town_name
+        );
+        self.api_service.get_blocking::<TownMaster>(&url)
+    }
+}
+
+#[cfg(all(test, feature = "blocking"))]
+mod blocking_tests {
+    use crate::repository::chimei_ruiju::town::TownMasterRepository;
+    use crate::service::chimei_ruiju::ChimeiRuijuApiService;
+    use jisx0401::Prefecture;
+
+    #[test]
+    fn 京都府京都市伏見区魚屋町() {
+        let repository = TownMasterRepository {
+            api_service: ChimeiRuijuApiService {},
+        };
+        let result = repository.get_blocking(&Prefecture::KYOTO, "京都市伏見区", "魚屋町");
+        assert!(result.is_ok());
+        let entity = result.unwrap();
+        assert_eq!(entity.name, "魚屋町");
+    }
+}