diff --git a/.github/workflows/tunny_ci.yml b/.github/workflows/tunny_ci.yml
index e261e53c..fa7ddb6b 100644
--- a/.github/workflows/tunny_ci.yml
+++ b/.github/workflows/tunny_ci.yml
@@ -73,7 +73,7 @@ jobs:
       - name: Install dependencies
         run: |
           dotnet restore
-          pip install optuna find-libpython
+          pip install optuna optuna_dashboard find-libpython botorch
 
       - name: Set Python DLL path and PYTHONHOME
         run: |
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 675ce3e8..30a839d2 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -8,6 +8,7 @@
         "HITL",
         "hovertemplate",
         "Hyperband",
+        "isinstance",
         "libpython",
         "rhinocode",
         "showlegend",
diff --git a/Optuna/Study/StudyWrapper.cs b/Optuna/Study/StudyWrapper.cs
index a1fbd2c2..d3434d30 100644
--- a/Optuna/Study/StudyWrapper.cs
+++ b/Optuna/Study/StudyWrapper.cs
@@ -28,10 +28,11 @@ public StudyWrapper(dynamic study)
             PyInstance = study;
 
             dynamic optuna = Py.Import("optuna");
+            dynamic dashboard = Py.Import("optuna_dashboard");
             dynamic py = Py.Import("builtins");
-            if (!py.isinstance(study, optuna.study.Study))
+            if (!py.isinstance(study, optuna.study.Study) && !py.isinstance(study, dashboard.preferential.PreferentialStudy))
             {
-                throw new ArgumentException("study must be an instance of optuna.study.Study.");
+                throw new ArgumentException("study must be an instance of optuna.study.Study or optuna_dashboard.preferential.PreferentialStudy.");
             }
         }
 
diff --git a/OptunaTests/Dashboard/HumanInTheLoop/PreferentialTests.cs b/OptunaTests/Dashboard/HumanInTheLoop/PreferentialTests.cs
new file mode 100644
index 00000000..e677e646
--- /dev/null
+++ b/OptunaTests/Dashboard/HumanInTheLoop/PreferentialTests.cs
@@ -0,0 +1,33 @@
+using Optuna.Sampler.Dashboard;
+using Optuna.Study;
+
+using OptunaTests;
+
+using Python.Runtime;
+
+using Xunit;
+
+namespace Optuna.Dashboard.HumanInTheLoop.Tests
+{
+    public class PreferentialTests : IClassFixture<TestFixture>
+    {
+        private readonly TestFixture _fixture;
+
+        public PreferentialTests(TestFixture fixture)
+        {
+            _fixture = fixture;
+        }
+
+        [Fact]
+        public void CreateStudyTest()
+        {
+            using (Py.GIL())
+            {
+                dynamic sampler = new PreferentialGpSampler().ToPython();
+                var preferential = new Preferential("tmpPath", "storagePath", sampler);
+                StudyWrapper study = preferential.CreateStudy(10, null, null, "objectiveName");
+                Assert.NotNull(study);
+            }
+        }
+    }
+}
diff --git a/OptunaTests/Study/StudyWrapperTests.cs b/OptunaTests/Study/StudyWrapperTests.cs
index d891a86e..e1ff7156 100644
--- a/OptunaTests/Study/StudyWrapperTests.cs
+++ b/OptunaTests/Study/StudyWrapperTests.cs
@@ -18,7 +18,20 @@ public StudyWrapperTests(TestFixture fixture)
         }
 
         [Fact]
-        public void ConstructorArgTypeTest()
+        public void ConstructorArgStudyTest()
+        {
+            using (Py.GIL())
+            {
+                dynamic optuna = Py.Import("optuna");
+                dynamic study = optuna.create_study();
+                var studyWrapper = new StudyWrapper(study);
+                Assert.Equal(study, studyWrapper.PyInstance);
+                Assert.Equal(0, studyWrapper.Id);
+            }
+        }
+
+        [Fact]
+        public void ConstructorArgPyIntTest()
         {
             using (Py.GIL())
             {