diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainGroup.cs b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainGroup.cs
new file mode 100644
index 0000000..35a45b2
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainGroup.cs
@@ -0,0 +1,68 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace AsmdefHelper.DependencyGraph.Editor.DependencyNode {
+    public class DomainGroup {
+        readonly Dictionary<string, List<DomainUnit>> dict;
+
+        public DomainGroup() {
+            dict = new Dictionary<string, List<DomainUnit>>();
+        }
+
+        public void Create(IEnumerable<string> all) {
+            dict.Clear();
+            foreach (var str in all) {
+                var unit = new DomainUnit(str, '.');
+                if (!unit.HasSubDomain()) {
+                    unit = new DomainUnit(str, '-');
+                }
+                if (!unit.HasSubDomain()) {
+                    unit = new DomainUnit(str, '_');
+                }
+
+                if (!unit.HasSubDomain()) {
+                    dict.Add(unit.FullName, new List<DomainUnit> { unit });
+                } else {
+                    if (dict.TryGetValue(unit.TopDomain, out var list)) {
+                        list.Add(unit);
+                    } else {
+                        dict.Add(unit.TopDomain, new List<DomainUnit> { unit });
+                    }
+                }
+            }
+            // 1つしかなかったものを単独とする
+            var soloKeys = GetSoloDomains().ToArray();
+            foreach (var key in soloKeys) {
+                var unit = dict[key].FirstOrDefault();
+                if (unit == null || key == unit.FullName) {
+                    continue;
+                }
+
+                dict.Remove(key);
+                var newKey = unit.FullName;
+                if (dict.ContainsKey(newKey)) {
+                    dict[newKey].Add(unit);
+                } else {
+                    dict.Add(newKey, new List<DomainUnit> { new DomainUnit(unit.FullName, '\0') });
+                }
+            }
+        }
+
+        public IEnumerable<string> GetTopDomains() => dict.Keys;
+        public IEnumerable<string> GetSoloDomains() => dict
+            .Where(x => x.Value.Count == 1)
+            .Select(x => x.Key);
+
+        public IEnumerable<string> GetTopDomainsWithSomeSubDomains() => dict
+            .Keys
+            .Except(GetSoloDomains());
+
+        public IEnumerable<string> GetSubDomains(string topDomain) {
+            if (dict.TryGetValue(topDomain, out var list))
+            {
+                return list.Select(x => x.SubDomain);
+            }
+            return new string[0];
+        }
+    }
+}
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainGroup.cs.meta b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainGroup.cs.meta
new file mode 100644
index 0000000..fe937f9
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainGroup.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: d9fe84ab1b8c44b0a841738f0ecb37d3
+timeCreated: 1606659209
\ No newline at end of file
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainUnit.cs b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainUnit.cs
new file mode 100644
index 0000000..d2969bd
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainUnit.cs
@@ -0,0 +1,27 @@
+
+
+using System;
+using System.Linq;
+
+namespace AsmdefHelper.DependencyGraph.Editor.DependencyNode {
+    public class DomainUnit {
+        public readonly string FullName;
+        public readonly string TopDomain;
+        public readonly string SubDomain;
+
+        public DomainUnit(string fullName, char separator) {
+            this.FullName = fullName;
+            if (string.IsNullOrEmpty(FullName)) return;
+            var split = fullName.Split(separator).Where(x => !string.IsNullOrEmpty(x)).ToArray();
+            if (split.Length < 2) {
+                TopDomain = fullName.Replace(separator.ToString(), "");
+                SubDomain = string.Empty;
+            } else {
+                TopDomain = split[0];
+                SubDomain = split.Skip(1).Aggregate((a, b) => $"{a}{separator}{b}");
+            }
+        }
+
+        public bool HasSubDomain() => !string.IsNullOrEmpty(SubDomain);
+    }
+}
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainUnit.cs.meta b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainUnit.cs.meta
new file mode 100644
index 0000000..d3c5030
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/DomainUnit.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 2927a4439ddc45a0a386b64e05220d53
+timeCreated: 1606658272
\ No newline at end of file
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainGroupTest.cs b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainGroupTest.cs
new file mode 100644
index 0000000..cd6d2b7
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainGroupTest.cs
@@ -0,0 +1,52 @@
+using System.Collections;
+using System.Linq;
+using NUnit.Framework;
+using UnityEditor;
+using UnityEngine.TestTools;
+
+namespace AsmdefHelper.DependencyGraph.Editor.DependencyNode.Tests {
+    public class DomainGroupTest {
+
+        readonly string[] inputs ={
+            "unity.hoge",
+            "unity.fuga",
+            "unity.foo.bar",
+            "UniRx",
+            "UniRx.Async",
+            "zenject",
+            "zenject-test-framework",
+            "MyAsmdef",
+            "MyAsmdef2_Test",
+            "MyAsmdef3.hoge",
+            "MyAsmdef3-hoge",
+        };
+
+        [Test]
+        public void TestDomainGroup() {
+            var group = new DomainGroup();
+                group.Create(inputs);
+            Assert.That(group.GetTopDomains().Count(), Is.EqualTo(6));
+            Assert.That(group.GetSubDomains("unity").Count(), Is.EqualTo(3));
+            Assert.That(group.GetSubDomains("UniRx").Count(), Is.EqualTo(2));
+            Assert.That(group.GetSubDomains("zenject").Count(), Is.EqualTo(2));
+            Assert.That(group.GetSubDomains("MyAsmdef").Count(), Is.EqualTo(1));
+            Assert.That(group.GetSubDomains("MyAsmdef2_Test").Count(), Is.EqualTo(1));
+            Assert.That(group.GetSubDomains("MyAsmdef3").Count(), Is.EqualTo(2));
+
+            Assert.That(group.GetTopDomainsWithSomeSubDomains().Count(), Is.EqualTo(4));
+            Assert.That(group.GetSoloDomains().Count(), Is.EqualTo(2));
+
+            Assert.That(group.GetSubDomains("unity").Any(x => x == "hoge"), Is.True);
+            Assert.That(group.GetSubDomains("unity").Any(x => x == "fuga"), Is.True);
+            Assert.That(group.GetSubDomains("unity").Any(x => x == "foo.bar"), Is.True);
+            Assert.That(group.GetSubDomains("UniRx").Any(x => x == ""), Is.True);
+            Assert.That(group.GetSubDomains("UniRx").Any(x => x == "Async"), Is.True);
+            Assert.That(group.GetSubDomains("zenject").Any(x => x == ""), Is.True);
+            Assert.That(group.GetSubDomains("zenject").Any(x => x == "test-framework"), Is.True);
+            Assert.That(group.GetSubDomains("MyAsmdef").Any(x => x == ""), Is.True);
+            Assert.That(group.GetSubDomains("MyAsmdef2_Test").Any(x => x == ""), Is.True);
+            Assert.That(group.GetSubDomains("MyAsmdef3").Any(x => x == "hoge"), Is.True);
+            Assert.That(group.GetSubDomains("MyAsmdef3").Count(x => x == "hoge"), Is.EqualTo(2));
+        }
+    }
+}
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainGroupTest.cs.meta b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainGroupTest.cs.meta
new file mode 100644
index 0000000..be3c792
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainGroupTest.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1ccc87caf20a4985a4e3c94bfc1c12c6
+timeCreated: 1606660230
\ No newline at end of file
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainUnitTest.cs b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainUnitTest.cs
new file mode 100644
index 0000000..95540d4
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainUnitTest.cs
@@ -0,0 +1,72 @@
+using System.Collections;
+using NUnit.Framework;
+using UnityEditor;
+using UnityEngine.TestTools;
+
+namespace AsmdefHelper.DependencyGraph.Editor.DependencyNode.Tests {
+    public class DomainUnitTest {
+
+        [Test]
+        public void TestDomainUnit_HasTopDomain() {
+            var unit = new DomainUnit("abc.def.ghi.jk", '.');
+            Assert.That(unit.FullName, Is.EqualTo("abc.def.ghi.jk"));
+            Assert.That(unit.TopDomain, Is.EqualTo("abc"));
+            Assert.That(unit.SubDomain, Is.EqualTo("def.ghi.jk"));
+            Assert.That(unit.HasSubDomain, Is.True);
+        }
+
+        [Test]
+        public void TestDomainUnit_HasNoTopDomain() {
+            var unit = new DomainUnit("abcdefghijk", '.');
+            Assert.That(unit.FullName, Is.EqualTo("abcdefghijk"));
+            Assert.That(unit.TopDomain, Is.EqualTo("abcdefghijk"));
+            Assert.That(unit.SubDomain, Is.Empty);
+            Assert.That(unit.HasSubDomain, Is.False);
+        }
+
+        [Test]
+        public void TestDomainUnit_StartWithSeparator() {
+            var unit = new DomainUnit(".abc", '.');
+            Assert.That(unit.FullName, Is.EqualTo(".abc"));
+            Assert.That(unit.TopDomain, Is.EqualTo("abc"));
+            Assert.That(unit.SubDomain, Is.Empty);
+            Assert.That(unit.HasSubDomain, Is.False);
+        }
+
+        [Test]
+        public void TestDomainUnit_EndWithSeparator() {
+            var unit = new DomainUnit("abc.", '.');
+            Assert.That(unit.FullName, Is.EqualTo("abc."));
+            Assert.That(unit.TopDomain, Is.EqualTo("abc"));
+            Assert.That(unit.SubDomain, Is.Empty);
+            Assert.That(unit.HasSubDomain, Is.False);
+        }
+
+        [Test]
+        public void TestDomainUnit_StartAndEndWithSeparator() {
+            var unit = new DomainUnit(".abc.def.", '.');
+            Assert.That(unit.FullName, Is.EqualTo(".abc.def."));
+            Assert.That(unit.TopDomain, Is.EqualTo("abc"));
+            Assert.That(unit.SubDomain, Is.EqualTo("def"));
+            Assert.That(unit.HasSubDomain, Is.True);
+        }
+
+        [Test]
+        public void TestDomainUnit_OnlySeparator() {
+            var unit = new DomainUnit(".", '.');
+            Assert.That(unit.FullName, Is.EqualTo("."));
+            Assert.That(unit.TopDomain, Is.Empty);
+            Assert.That(unit.SubDomain, Is.Empty);
+            Assert.That(unit.HasSubDomain, Is.False);
+        }
+
+        [Test]
+        public void TestDomainUnit_OnlySeparators() {
+            var unit = new DomainUnit("...", '.');
+            Assert.That(unit.FullName, Is.EqualTo("..."));
+            Assert.That(unit.TopDomain, Is.Empty);
+            Assert.That(unit.SubDomain, Is.Empty);
+            Assert.That(unit.HasSubDomain, Is.False);
+        }
+    }
+}
diff --git a/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainUnitTest.cs.meta b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainUnitTest.cs.meta
new file mode 100644
index 0000000..3e0f845
--- /dev/null
+++ b/Assets/AsmdefHelper/DependencyGraph/Editor/DependencyNode/Tests/DomainUnitTest.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: ecc6823b62f94fd3a910f5a885a201dc
+timeCreated: 1606658361
\ No newline at end of file