diff --git a/SVSim.EmulatedEntrypoint/Controllers/MyPageController.cs b/SVSim.EmulatedEntrypoint/Controllers/MyPageController.cs
index fbcdf8c0..87cadb9c 100644
--- a/SVSim.EmulatedEntrypoint/Controllers/MyPageController.cs
+++ b/SVSim.EmulatedEntrypoint/Controllers/MyPageController.cs
@@ -9,6 +9,7 @@ using SVSim.Database.Services;
 using SVSim.EmulatedEntrypoint.Constants;
 using SVSim.EmulatedEntrypoint.Infrastructure;
 using SVSim.EmulatedEntrypoint.Models.Dtos;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.MyPage;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Responses;
@@ -370,4 +371,13 @@ public class MyPageController : SVSimController
         if (!TryGetViewerId(out long __)) return Unauthorized();
         return new MyPageFinishBattleResponse { CheckUnfinishedBattle = 0 };
     }
+
+    [HttpPost("get_special_crystal_info")]
+    public ActionResult<EmptyResponse> GetSpecialCrystalInfo([FromBody] BaseRequest _)
+    {
+        if (!TryGetViewerId(out long __)) return Unauthorized();
+        // No special-crystal offers configured. Spec mock is `data: {}` for the no-offers
+        // case — special_crystal_info field is optional and omitted when absent.
+        return new EmptyResponse();
+    }
 }
diff --git a/SVSim.UnitTests/Controllers/MyPageControllerSpecialCrystalInfoTests.cs b/SVSim.UnitTests/Controllers/MyPageControllerSpecialCrystalInfoTests.cs
new file mode 100644
index 00000000..1801f561
--- /dev/null
+++ b/SVSim.UnitTests/Controllers/MyPageControllerSpecialCrystalInfoTests.cs
@@ -0,0 +1,23 @@
+using System.Net;
+using System.Text;
+using NUnit.Framework;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+public class MyPageControllerSpecialCrystalInfoTests
+{
+    [Test]
+    public async Task GetSpecialCrystalInfo_returns_empty()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync(tutorialState: 0);
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+
+        var requestJson = """{"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var response = await client.PostAsync("/mypage/get_special_crystal_info",
+            new StringContent(requestJson, Encoding.UTF8, "application/json"));
+
+        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
+    }
+}