diff --git a/illust-crud/src/main/kotlin/dev/usbharu/unos/illust/crud/RequestTaggingService.kt b/illust-crud/src/main/kotlin/dev/usbharu/unos/illust/crud/RequestTaggingService.kt
new file mode 100644
index 0000000..01ee41b
--- /dev/null
+++ b/illust-crud/src/main/kotlin/dev/usbharu/unos/illust/crud/RequestTaggingService.kt
@@ -0,0 +1,31 @@
+package dev.usbharu.unos.illust.crud
+
+import illust.tag.IllustTaggingServiceGrpcKt
+import illust.tag.taggingRequest
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
+import kotlinx.coroutines.withContext
+import java.util.*
+
+interface RequestTaggingService {
+    suspend fun requestTagging(illustId: UUID): List<String>
+}
+
+class RequestTaggingServiceImpl(private val clients: List<IllustTaggingServiceGrpcKt.IllustTaggingServiceCoroutineStub>) :
+    RequestTaggingService {
+    override suspend fun requestTagging(illustId: UUID): List<String> {
+        val taggingResults = withContext(Dispatchers.IO) {
+            clients.map {
+                async {
+                    it.requestTagging(taggingRequest {
+                        this.illustId = illustId.toString()
+                    })
+                }
+            }.awaitAll()
+        }
+
+        return taggingResults.flatMap { it.tagsList }
+    }
+
+}
\ No newline at end of file
diff --git a/unos-proto/src/main/proto/illust/tag/tag.proto b/unos-proto/src/main/proto/illust/tag/tag.proto
index 697354b..19a1cfc 100644
--- a/unos-proto/src/main/proto/illust/tag/tag.proto
+++ b/unos-proto/src/main/proto/illust/tag/tag.proto
@@ -9,5 +9,9 @@ message TaggingRequest{
 
 message TaggingResult{
   string illust_id = 1;
+  repeated string tags = 2;
+}
 
+service IllustTaggingService {
+  rpc requestTagging(TaggingRequest) returns (TaggingResult);
 }
\ No newline at end of file