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 ad59e939..83ac26f9 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
@@ -2,6 +2,6 @@ package dev.usbharu.hideout.core.domain.model.reaction
 
 interface ReactionRepository {
     suspend fun save(reaction: Reaction): Reaction
-    suspend fun findById(reactionId: String): Reaction?
+    suspend fun findById(reactionId: ReactionId): 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/ExposedReactionRepository.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedReactionRepository.kt
new file mode 100644
index 00000000..1d1d7564
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/ExposedReactionRepository.kt
@@ -0,0 +1,87 @@
+package dev.usbharu.hideout.core.infrastructure.exposedrepository
+
+import dev.usbharu.hideout.core.domain.model.actor.ActorId
+import dev.usbharu.hideout.core.domain.model.emoji.CustomEmojiId
+import dev.usbharu.hideout.core.domain.model.emoji.UnicodeEmoji
+import dev.usbharu.hideout.core.domain.model.post.PostId
+import dev.usbharu.hideout.core.domain.model.reaction.Reaction
+import dev.usbharu.hideout.core.domain.model.reaction.ReactionId
+import dev.usbharu.hideout.core.domain.model.reaction.ReactionRepository
+import dev.usbharu.hideout.core.domain.shared.domainevent.DomainEventPublisher
+import dev.usbharu.hideout.core.domain.shared.repository.DomainEventPublishableRepository
+import org.jetbrains.exposed.sql.*
+import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
+import org.jetbrains.exposed.sql.javatime.timestamp
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import org.springframework.stereotype.Repository
+
+@Repository
+class ExposedReactionRepository(override val domainEventPublisher: DomainEventPublisher) : ReactionRepository,
+    AbstractRepository(), DomainEventPublishableRepository<Reaction> {
+
+    override val logger: Logger
+        get() = Companion.logger
+
+
+    override suspend fun save(reaction: Reaction): Reaction {
+        return query {
+            Reactions.upsert {
+                it[Reactions.id] = reaction.id.value
+                it[Reactions.postId] = reaction.postId.id
+                it[Reactions.actorId] = reaction.actorId.id
+                it[Reactions.customEmojiId] = reaction.customEmojiId?.emojiId
+                it[Reactions.unicodeEmoji] = reaction.unicodeEmoji.name
+            }
+            onComplete {
+                update(reaction)
+            }
+            reaction
+        }
+    }
+
+    override suspend fun findById(reactionId: ReactionId): Reaction? {
+        return query {
+            Reactions.selectAll().where {
+                Reactions.id eq reactionId.value
+            }.singleOrNull()?.toReaction()
+        }
+    }
+
+    override suspend fun delete(reaction: Reaction) {
+        return query {
+            Reactions.deleteWhere {
+                Reactions.id eq reaction.id.value
+            }
+            onComplete {
+                update(reaction)
+            }
+        }
+    }
+
+    companion object {
+        private val logger = LoggerFactory.getLogger(ExposedReactionRepository::class.java)
+    }
+}
+
+fun ResultRow.toReaction(): Reaction {
+    return Reaction(
+        ReactionId(this[Reactions.id]),
+        PostId(this[Reactions.postId]),
+        ActorId(this[Reactions.actorId]),
+        this[Reactions.customEmojiId]?.let { CustomEmojiId(it) },
+        UnicodeEmoji(this[Reactions.unicodeEmoji]),
+        this[Reactions.createdAt]
+    )
+
+}
+
+object Reactions : Table("Reactions") {
+    val id = long("id")
+    val postId = long("post_id").references(Posts.id)
+    val actorId = long("actor_id").references(Actors.id)
+    val customEmojiId = long("custom_emoji_id").references(CustomEmojis.id).nullable()
+    val unicodeEmoji = varchar("unicode_emoji", 100)
+    val createdAt = timestamp("created_at")
+    override val primaryKey: PrimaryKey = PrimaryKey(id)
+}
\ No newline at end of file