diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiService.kt
new file mode 100644
index 00000000..4dd6e2d1
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiService.kt
@@ -0,0 +1,9 @@
+package dev.usbharu.hideout.activitypub.service.objects.emoji
+
+import dev.usbharu.hideout.activitypub.domain.model.Emoji
+import dev.usbharu.hideout.core.domain.model.emoji.CustomEmoji
+
+interface EmojiService {
+    suspend fun fetchEmoji(url: String): Pair<Emoji, CustomEmoji>
+    suspend fun fetchEmoji(emoji: Emoji): Pair<Emoji, CustomEmoji>
+}
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt
new file mode 100644
index 00000000..3c990b59
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/objects/emoji/EmojiServiceImpl.kt
@@ -0,0 +1,63 @@
+package dev.usbharu.hideout.activitypub.service.objects.emoji
+
+import dev.usbharu.hideout.activitypub.domain.model.Emoji
+import dev.usbharu.hideout.activitypub.service.common.APResourceResolveServiceImpl
+import dev.usbharu.hideout.activitypub.service.common.resolve
+import dev.usbharu.hideout.core.domain.model.emoji.CustomEmoji
+import dev.usbharu.hideout.core.domain.model.emoji.CustomEmojiRepository
+import dev.usbharu.hideout.core.service.instance.InstanceService
+import dev.usbharu.hideout.core.service.media.MediaService
+import dev.usbharu.hideout.core.service.media.RemoteMedia
+import org.springframework.stereotype.Service
+import java.net.URL
+import java.time.Instant
+
+@Service
+class EmojiServiceImpl(
+    private val customEmojiRepository: CustomEmojiRepository,
+    private val instanceService: InstanceService,
+    private val mediaService: MediaService,
+    private val apResourceResolveServiceImpl: APResourceResolveServiceImpl
+) : EmojiService {
+    override suspend fun fetchEmoji(url: String): Pair<Emoji, CustomEmoji> {
+        val emoji = apResourceResolveServiceImpl.resolve<Emoji>(url, null as Long?)
+        return fetchEmoji(emoji)
+    }
+
+    override suspend fun fetchEmoji(emoji: Emoji): Pair<Emoji, CustomEmoji> {
+        return emoji to save(emoji)
+    }
+
+    private suspend fun save(emoji: Emoji): CustomEmoji {
+        val domain = URL(emoji.id).host
+        val name = emoji.name.trim(':')
+        val customEmoji = customEmojiRepository.findByNameAndDomain(name, domain)
+
+        if (customEmoji != null) {
+            return customEmoji
+        }
+
+        val instance = instanceService.fetchInstance(emoji.id)
+
+        val media = mediaService.uploadRemoteMedia(
+            RemoteMedia(
+                emoji.name,
+                emoji.icon.url,
+                emoji.icon.mediaType.orEmpty(),
+                null
+            )
+        )
+
+        val customEmoji1 = CustomEmoji(
+            customEmojiRepository.generateId(),
+            name,
+            domain,
+            instance.id,
+            media.url,
+            null,
+            Instant.now()
+        )
+
+        return customEmojiRepository.save(customEmoji1)
+    }
+}
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmojiRepository.kt b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmojiRepository.kt
index 59aa34aa..df7e87f3 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmojiRepository.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/domain/model/emoji/CustomEmojiRepository.kt
@@ -1,7 +1,9 @@
 package dev.usbharu.hideout.core.domain.model.emoji
 
 interface CustomEmojiRepository {
+    suspend fun generateId(): Long
     suspend fun save(customEmoji: CustomEmoji): CustomEmoji
     suspend fun findById(id: Long): CustomEmoji?
     suspend fun delete(customEmoji: CustomEmoji)
+    suspend fun findByNameAndDomain(name: String, domain: String): CustomEmoji?
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt
index 3296f5d5..0df58975 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/exposedrepository/CustomEmojiRepositoryImpl.kt
@@ -1,5 +1,6 @@
 package dev.usbharu.hideout.core.infrastructure.exposedrepository
 
+import dev.usbharu.hideout.application.service.id.IdGenerateService
 import dev.usbharu.hideout.core.domain.model.emoji.CustomEmoji
 import dev.usbharu.hideout.core.domain.model.emoji.CustomEmojiRepository
 import org.jetbrains.exposed.sql.*
@@ -8,8 +9,13 @@ import org.jetbrains.exposed.sql.javatime.CurrentTimestamp
 import org.jetbrains.exposed.sql.javatime.timestamp
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
+import org.springframework.stereotype.Repository
+
+@Repository
+class CustomEmojiRepositoryImpl(private val idGenerateService: IdGenerateService) : CustomEmojiRepository,
+    AbstractRepository() {
+    override suspend fun generateId(): Long = idGenerateService.generateId()
 
-class CustomEmojiRepositoryImpl : CustomEmojiRepository, AbstractRepository() {
     override suspend fun save(customEmoji: CustomEmoji): CustomEmoji = query {
         val singleOrNull = CustomEmojis.select { CustomEmojis.id eq customEmoji.id }.forUpdate().singleOrNull()
         if (singleOrNull == null) {
@@ -43,6 +49,13 @@ class CustomEmojiRepositoryImpl : CustomEmojiRepository, AbstractRepository() {
         CustomEmojis.deleteWhere { CustomEmojis.id eq customEmoji.id }
     }
 
+    override suspend fun findByNameAndDomain(name: String, domain: String): CustomEmoji? = query {
+        return@query CustomEmojis
+            .select { CustomEmojis.name eq name and (CustomEmojis.domain eq domain) }
+            .singleOrNull()
+            ?.toCustomEmoji()
+    }
+
     override val logger: Logger
         get() = Companion.logger
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt
index 2a731029..a6ffeb3b 100644
--- a/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImpl.kt
@@ -1,6 +1,7 @@
 package dev.usbharu.hideout.core.service.reaction
 
 import dev.usbharu.hideout.activitypub.service.activity.like.APReactionService
+import dev.usbharu.hideout.core.domain.model.emoji.UnicodeEmoji
 import dev.usbharu.hideout.core.domain.model.reaction.Reaction
 import dev.usbharu.hideout.core.domain.model.reaction.ReactionRepository
 import org.jetbrains.exposed.exceptions.ExposedSQLException
@@ -17,7 +18,7 @@ class ReactionServiceImpl(
         if (reactionRepository.existByPostIdAndActorIdAndEmojiId(postId, actorId, 0).not()) {
             try {
                 reactionRepository.save(
-                    Reaction(reactionRepository.generateId(), 0, postId, actorId)
+                    Reaction(reactionRepository.generateId(), UnicodeEmoji("❤"), postId, actorId)
                 )
             } catch (_: ExposedSQLException) {
             }
@@ -42,7 +43,7 @@ class ReactionServiceImpl(
             reactionRepository.delete(findByPostIdAndUserIdAndEmojiId)
         }
 
-        val reaction = Reaction(reactionRepository.generateId(), 0, postId, actorId)
+        val reaction = Reaction(reactionRepository.generateId(), UnicodeEmoji("❤"), postId, actorId)
         reactionRepository.save(reaction)
         apReactionService.reaction(reaction)
     }