diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/application/reaction/RemoveReaction.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/application/reaction/RemoveReaction.kt
new file mode 100644
index 00000000..6a7dd7ff
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/application/reaction/RemoveReaction.kt
@@ -0,0 +1,7 @@
+package dev.usbharu.hideout.core.application.reaction
+
+data class RemoveReaction(
+    val postId: Long,
+    val customEmojiId: Long?,
+    val unicodeEmoji: String
+)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/application/reaction/UserRemoveReactionApplicationService.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/application/reaction/UserRemoveReactionApplicationService.kt
new file mode 100644
index 00000000..b53f21f8
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/application/reaction/UserRemoveReactionApplicationService.kt
@@ -0,0 +1,50 @@
+package dev.usbharu.hideout.core.application.reaction
+
+import dev.usbharu.hideout.core.application.shared.LocalUserAbstractApplicationService
+import dev.usbharu.hideout.core.application.shared.Transaction
+import dev.usbharu.hideout.core.domain.model.emoji.CustomEmojiRepository
+import dev.usbharu.hideout.core.domain.model.post.PostId
+import dev.usbharu.hideout.core.domain.model.reaction.ReactionRepository
+import dev.usbharu.hideout.core.domain.model.support.principal.LocalUser
+import dev.usbharu.hideout.core.domain.service.emoji.UnicodeEmojiService
+import org.slf4j.LoggerFactory
+import org.springframework.stereotype.Service
+
+@Service
+class UserRemoveReactionApplicationService(
+    transaction: Transaction,
+    private val customEmojiRepository: CustomEmojiRepository,
+    private val reactionRepository: ReactionRepository,
+    private val unicodeEmojiService: UnicodeEmojiService
+) :
+    LocalUserAbstractApplicationService<RemoveReaction, Unit>(
+        transaction, logger
+    ) {
+    override suspend fun internalExecute(command: RemoveReaction, principal: LocalUser) {
+        val postId = PostId(command.postId)
+
+        val customEmoji = command.customEmojiId?.let { customEmojiRepository.findById(it) }
+
+        val unicodeEmoji = if (unicodeEmojiService.isUnicodeEmoji(command.unicodeEmoji)) {
+            command.unicodeEmoji
+        } else {
+            "❤"
+        }
+        val reaction =
+            reactionRepository.findByPostIdAndActorIdAndCustomEmojiIdOrUnicodeEmoji(
+                postId,
+                principal.actorId,
+                customEmoji?.id,
+                unicodeEmoji
+            )
+                ?: throw IllegalArgumentException("Reaction $postId ${principal.actorId} ${customEmoji?.id} $unicodeEmoji not found.")
+
+        reaction.delete()
+
+        reactionRepository.delete(reaction)
+    }
+
+    companion object {
+        private val logger = LoggerFactory.getLogger(UserRemoveReactionApplicationService::class.java)
+    }
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/Reaction.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/Reaction.kt
index ea3eac76..93b43000 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/Reaction.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/Reaction.kt
@@ -32,6 +32,10 @@ class Reaction(
         return id.hashCode()
     }
 
+    fun delete() {
+        addDomainEvent(ReactionEventFactory(this).createEvent(ReactionEvent.DELETE))
+    }
+
     companion object {
         fun create(
             id: ReactionId,
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt
index f2ed4779..9aa1f6aa 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/reaction/ReactionRepository.kt
@@ -15,5 +15,12 @@ interface ReactionRepository {
         unicodeEmoji: String
     ): Boolean
 
+    suspend fun findByPostIdAndActorIdAndCustomEmojiIdOrUnicodeEmoji(
+        postId: PostId,
+        actorId: ActorId,
+        customEmojiId: CustomEmojiId?,
+        unicodeEmoji: String
+    ): Reaction?
+
     suspend fun delete(reaction: Reaction)
 }
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedPostRepository.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedPostRepository.kt
index 9408d01a..37a476b1 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedPostRepository.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedPostRepository.kt
@@ -168,7 +168,7 @@ class ExposedPostRepository(
                 Posts.id eq id.id
             }
             .let(postQueryMapper::map)
-            .first()
+            .firstOrNull()
     }
 
     override suspend fun findAllById(ids: List<PostId>): List<Post> {
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedReactionRepository.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedReactionRepository.kt
index f3ac7b96..f3fc6886 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedReactionRepository.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedReactionRepository.kt
@@ -82,6 +82,21 @@ class ExposedReactionRepository(override val domainEventPublisher: DomainEventPu
         }
     }
 
+    override suspend fun findByPostIdAndActorIdAndCustomEmojiIdOrUnicodeEmoji(
+        postId: PostId,
+        actorId: ActorId,
+        customEmojiId: CustomEmojiId?,
+        unicodeEmoji: String
+    ): Reaction? {
+        return query {
+
+            Reactions.selectAll().where {
+                Reactions.postId.eq(postId.id).and(Reactions.actorId eq actorId.id)
+                    .and((Reactions.customEmojiId eq customEmojiId?.emojiId or (Reactions.unicodeEmoji eq unicodeEmoji)))
+            }.limit(1).singleOrNull()?.toReaction()
+        }
+    }
+
     companion object {
         private val logger = LoggerFactory.getLogger(ExposedReactionRepository::class.java)
     }
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PostsController.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PostsController.kt
index 0f6558c6..26e31f3c 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PostsController.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/interfaces/web/posts/PostsController.kt
@@ -5,7 +5,9 @@ import dev.usbharu.hideout.core.application.instance.GetLocalInstanceApplication
 import dev.usbharu.hideout.core.application.post.GetPostDetail
 import dev.usbharu.hideout.core.application.post.GetPostDetailApplicationService
 import dev.usbharu.hideout.core.application.reaction.CreateReaction
+import dev.usbharu.hideout.core.application.reaction.RemoveReaction
 import dev.usbharu.hideout.core.application.reaction.UserCreateReactionApplicationService
+import dev.usbharu.hideout.core.application.reaction.UserRemoveReactionApplicationService
 import dev.usbharu.hideout.core.infrastructure.springframework.SpringSecurityFormLoginPrincipalContextHolder
 import org.springframework.security.access.AccessDeniedException
 import org.springframework.stereotype.Controller
@@ -19,7 +21,8 @@ class PostsController(
     private val getPostDetailApplicationService: GetPostDetailApplicationService,
     private val springSecurityFormLoginPrincipalContextHolder: SpringSecurityFormLoginPrincipalContextHolder,
     private val getLocalInstanceApplicationService: GetLocalInstanceApplicationService,
-    private val userCreateReactionApplicationService: UserCreateReactionApplicationService
+    private val userCreateReactionApplicationService: UserCreateReactionApplicationService,
+    private val userRemoveReactionApplicationService: UserRemoveReactionApplicationService
 ) {
     @GetMapping("/users/{name}/posts/{id}")
     suspend fun postById(@PathVariable id: Long, model: Model): String {
@@ -48,4 +51,17 @@ class PostsController(
         )
         return "redirect:/users/$name/posts/$id"
     }
+
+    @PostMapping("/users/{name}/posts/{id}/unfavourite")
+    suspend fun unfavourite(@PathVariable id: Long, @PathVariable name: String): String {
+        val principal = springSecurityFormLoginPrincipalContextHolder.getPrincipal()
+        userRemoveReactionApplicationService.execute(
+            RemoveReaction(
+                id,
+                null,
+                "❤"
+            ), principal
+        )
+        return "redirect:/users/$name/posts/$id"
+    }
 }
diff --git a/hideout-core/src/main/resources/db/migration/V1__Init_DB.sql b/hideout-core/src/main/resources/db/migration/V1__Init_DB.sql
index 44bfbcf5..f4c62702 100644
--- a/hideout-core/src/main/resources/db/migration/V1__Init_DB.sql
+++ b/hideout-core/src/main/resources/db/migration/V1__Init_DB.sql
@@ -329,5 +329,6 @@ create table if not exists reactions
     unicode_emoji   varchar(100) not null,
     created_at      timestamp    not null,
     constraint fk_reactions_post_id__id foreign key (post_id) references posts (id) on delete cascade on update cascade,
-    constraint fk_reactions_actor_id__id foreign key (actor_id) references actors (id) on delete cascade on update cascade
+    constraint fk_reactions_actor_id__id foreign key (actor_id) references actors (id) on delete cascade on update cascade,
+    unique (post_id, actor_id, created_at, unicode_emoji)
 );
\ No newline at end of file
diff --git a/hideout-core/src/main/resources/templates/fragments-post.html b/hideout-core/src/main/resources/templates/fragments-post.html
index 671cec83..d16f4861 100644
--- a/hideout-core/src/main/resources/templates/fragments-post.html
+++ b/hideout-core/src/main/resources/templates/fragments-post.html
@@ -44,14 +44,27 @@
 
 <div class="post-controller" th:fragment="single-post-controller(post)">
     <!--/*@thymesVar id="post" type="dev.usbharu.hideout.core.application.post.PostDetail"*/-->
-    <form method="post" th:action="@{/users/a/posts/{id}/favourite(id=${post.id})}">
-        <a th:href="${'/publish?reply_to=' + post.id}">Reply</a>
-        <input type="submit" value="❤">
-        <a th:href="${post.apId}">
-            <time th:datetime="${post.createdAt}"
-                  th:text="${#temporals.format(post.createdAt, 'yyyy-MM-dd HH:mm')}"></time>
-        </a>
-    </form>
+    <th:block th:if="${post.favourited}">
+        <form method="post" th:action="@{/users/a/posts/{id}/unfavourite(id=${post.id})}">
+            <a th:href="${'/publish?reply_to=' + post.id}">Reply</a>
+            <input type="submit" value="[❤]">
+            <a th:href="${post.apId}">
+                <time th:datetime="${post.createdAt}"
+                      th:text="${#temporals.format(post.createdAt, 'yyyy-MM-dd HH:mm')}"></time>
+            </a>
+        </form>
+    </th:block>
+    <th:block th:unless="${post.favourited}">
+        <form method="post" th:action="@{/users/a/posts/{id}/favourite(id=${post.id})}">
+            <a th:href="${'/publish?reply_to=' + post.id}">Reply</a>
+            <input type="submit" value="❤">
+            <a th:href="${post.apId}">
+                <time th:datetime="${post.createdAt}"
+                      th:text="${#temporals.format(post.createdAt, 'yyyy-MM-dd HH:mm')}"></time>
+            </a>
+        </form>
+    </th:block>
+
 </div>