diff --git a/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/account/MastodonAccountApiController.kt b/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/account/MastodonAccountApiController.kt
index 46a03fbe..f3c05765 100644
--- a/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/account/MastodonAccountApiController.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/mastodon/interfaces/api/account/MastodonAccountApiController.kt
@@ -3,7 +3,10 @@ package dev.usbharu.hideout.mastodon.interfaces.api.account
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.controller.mastodon.generated.AccountApi
 import dev.usbharu.hideout.core.service.user.UserCreateDto
+import dev.usbharu.hideout.domain.mastodon.model.generated.Account
 import dev.usbharu.hideout.domain.mastodon.model.generated.CredentialAccount
+import dev.usbharu.hideout.domain.mastodon.model.generated.FollowRequestBody
+import dev.usbharu.hideout.domain.mastodon.model.generated.Relationship
 import dev.usbharu.hideout.mastodon.service.account.AccountApiService
 import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpStatus
@@ -18,6 +21,19 @@ class MastodonAccountApiController(
     private val accountApiService: AccountApiService,
     private val transaction: Transaction
 ) : AccountApi {
+
+    override suspend fun apiV1AccountsIdFollowPost(
+        id: String,
+        followRequestBody: FollowRequestBody?
+    ): ResponseEntity<Relationship> {
+        val principal = SecurityContextHolder.getContext().getAuthentication().principal as Jwt
+
+        return ResponseEntity.ok(accountApiService.follow(principal.getClaim<String>("uid").toLong(), id.toLong()))
+    }
+
+    override suspend fun apiV1AccountsIdGet(id: String): ResponseEntity<Account> =
+        ResponseEntity.ok(accountApiService.account(id.toLong()))
+
     override suspend fun apiV1AccountsVerifyCredentialsGet(): ResponseEntity<CredentialAccount> {
         val principal = SecurityContextHolder.getContext().getAuthentication().principal as Jwt
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/mastodon/service/account/AccountApiService.kt b/src/main/kotlin/dev/usbharu/hideout/mastodon/service/account/AccountApiService.kt
index 9fc44262..b2e2792a 100644
--- a/src/main/kotlin/dev/usbharu/hideout/mastodon/service/account/AccountApiService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/mastodon/service/account/AccountApiService.kt
@@ -1,25 +1,28 @@
 package dev.usbharu.hideout.mastodon.service.account
 
 import dev.usbharu.hideout.application.external.Transaction
+import dev.usbharu.hideout.core.domain.model.user.UserRepository
+import dev.usbharu.hideout.core.query.FollowerQueryService
 import dev.usbharu.hideout.core.service.user.UserCreateDto
 import dev.usbharu.hideout.core.service.user.UserService
-import dev.usbharu.hideout.domain.mastodon.model.generated.Account
-import dev.usbharu.hideout.domain.mastodon.model.generated.CredentialAccount
-import dev.usbharu.hideout.domain.mastodon.model.generated.CredentialAccountSource
-import dev.usbharu.hideout.domain.mastodon.model.generated.Role
+import dev.usbharu.hideout.domain.mastodon.model.generated.*
 import org.springframework.stereotype.Service
 
 @Service
 interface AccountApiService {
     suspend fun verifyCredentials(userid: Long): CredentialAccount
     suspend fun registerAccount(userCreateDto: UserCreateDto): Unit
+    suspend fun follow(userid: Long, followeeId: Long): Relationship
+    suspend fun account(id: Long): Account
 }
 
 @Service
 class AccountApiServiceImpl(
     private val accountService: AccountService,
     private val transaction: Transaction,
-    private val userService: UserService
+    private val userService: UserService,
+    private val followerQueryService: FollowerQueryService,
+    private val userRepository: UserRepository
 ) :
     AccountApiService {
     override suspend fun verifyCredentials(userid: Long): CredentialAccount = transaction.transaction {
@@ -31,6 +34,42 @@ class AccountApiServiceImpl(
         userService.createLocalUser(UserCreateDto(userCreateDto.name, userCreateDto.name, "", userCreateDto.password))
     }
 
+    override suspend fun follow(userid: Long, followeeId: Long): Relationship = transaction.transaction {
+
+        val alreadyFollow = followerQueryService.alreadyFollow(followeeId, userid)
+
+
+        val followRequest = if (alreadyFollow) {
+            true
+        } else {
+            userService.followRequest(followeeId, userid)
+        }
+
+        val alreadyFollow1 = followerQueryService.alreadyFollow(userid, followeeId)
+
+        val followRequestsById = userRepository.findFollowRequestsById(followeeId, userid)
+
+        return@transaction Relationship(
+            followeeId.toString(),
+            followRequest,
+            true,
+            false,
+            alreadyFollow1,
+            false,
+            false,
+            false,
+            false,
+            followRequestsById,
+            false,
+            false,
+            ""
+        )
+    }
+
+    override suspend fun account(id: Long): Account = transaction.transaction {
+        return@transaction accountService.findById(id)
+    }
+
     private fun from(account: Account): CredentialAccount {
         return CredentialAccount(
             id = account.id,
diff --git a/src/main/resources/openapi/mastodon.yaml b/src/main/resources/openapi/mastodon.yaml
index 6f93fa36..03fa7a69 100644
--- a/src/main/resources/openapi/mastodon.yaml
+++ b/src/main/resources/openapi/mastodon.yaml
@@ -206,6 +206,55 @@ paths:
         200:
           description: 成功
 
+  /api/v1/accounts/{id}:
+    get:
+      tags:
+        - account
+      security:
+        - { }
+      parameters:
+        - in: path
+          name: id
+          required: true
+          schema:
+            type: string
+      responses:
+        200:
+          description: 成功
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Account"
+
+  /api/v1/accounts/{id}/follow:
+    post:
+      tags:
+        - account
+      security:
+        - OAuth2:
+            - "write:follows"
+      parameters:
+        - in: path
+          name: id
+          required: true
+          schema:
+            type: string
+      requestBody:
+        required: false
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/FollowRequestBody"
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: "#/components/schemas/FollowRequestBody"
+      responses:
+        200:
+          description: 成功
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Relationship"
   /api/v1/timelines/public:
     get:
       tags:
@@ -1314,6 +1363,8 @@ components:
           type: string
         client_secret:
           type: string
+        redirect_uri:
+          type: string
       required:
         - name
         - vapid_key
@@ -1333,6 +1384,65 @@ components:
         - client_name
         - redirect_uris
 
+    Relationship:
+      type: object
+      properties:
+        id:
+          type: string
+        following:
+          type: boolean
+        showing_reblogs:
+          type: boolean
+        notifying:
+          type: boolean
+        followed_by:
+          type: boolean
+        blocking:
+          type: boolean
+        blocked_by:
+          type: boolean
+        muting:
+          type: boolean
+        muting_notifications:
+          type: boolean
+        requested:
+          type: boolean
+        domain_blocking:
+          type: boolean
+        endorsed:
+          type: boolean
+        note:
+          type: string
+      required:
+        - id
+        - following
+        - showing_reblogs
+        - notifying
+        - followed_by
+        - blocking
+        - blocked_by
+        - muting
+        - muting_notifications
+        - requested
+        - domain_blocking
+        - endorsed
+        - note
+
+
+    FollowRequestBody:
+      type: object
+      properties:
+        reblogs:
+          type: boolean
+          default: true
+        notify:
+          type: boolean
+          default: false
+        languages:
+          type: array
+          items:
+            type: string
+
   securitySchemes:
     OAuth2:
       type: oauth2