diff --git a/app/Io/CheckinCsvImporter.php b/app/Io/CheckinCsvImporter.php
index f91a063..364a007 100644
--- a/app/Io/CheckinCsvImporter.php
+++ b/app/Io/CheckinCsvImporter.php
@@ -79,7 +79,11 @@ class CheckinCsvImporter
                             break;
                         }
                         if (mb_strlen($tag) > 255) {
-                            $errors[] = "{$line} 行 : {$column}列は255文字以内にしてください。";
+                            $errors[] = "{$line} 行 : {$column}は255文字以内にしてください。";
+                            continue 2;
+                        }
+                        if (strpos($tag, "\n") !== false) {
+                            $errors[] = "{$line} 行 : {$column}に改行を含めることはできません。";
                             continue 2;
                         }
 
@@ -87,9 +91,8 @@ class CheckinCsvImporter
                         $tagIds[] = $tag->id;
                     }
                 }
-                $ejaculation->tags()->sync($tagIds);
-
                 $ejaculation->save();
+                $ejaculation->tags()->sync($tagIds);
             }
 
             if (!empty($errors)) {
diff --git a/tests/Unit/Io/CheckinCsvImporterTest.php b/tests/Unit/Io/CheckinCsvImporterTest.php
index cf91770..f3ecfb3 100644
--- a/tests/Unit/Io/CheckinCsvImporterTest.php
+++ b/tests/Unit/Io/CheckinCsvImporterTest.php
@@ -168,4 +168,67 @@ class CheckinCsvImporterTest extends TestCase
         $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/link-not-url.utf8.csv');
         $importer->execute();
     }
+
+    public function testTag1UTF8()
+    {
+        $user = factory(User::class)->create();
+
+        $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/tag1.utf8.csv');
+        $importer->execute();
+        $ejaculation = $user->ejaculations()->first();
+        $tags = $ejaculation->tags()->get();
+
+        $this->assertSame(1, $user->ejaculations()->count());
+        $this->assertCount(1, $tags);
+        $this->assertEquals('貧乳', $tags[0]->name);
+    }
+
+    public function testTag2UTF8()
+    {
+        $user = factory(User::class)->create();
+
+        $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/tag2.utf8.csv');
+        $importer->execute();
+        $ejaculation = $user->ejaculations()->first();
+        $tags = $ejaculation->tags()->get();
+
+        $this->assertSame(1, $user->ejaculations()->count());
+        $this->assertCount(2, $tags);
+        $this->assertEquals('貧乳', $tags[0]->name);
+        $this->assertEquals('巨乳', $tags[1]->name);
+    }
+
+    public function testTagOverLengthUTF8()
+    {
+        $user = factory(User::class)->create();
+        $this->expectException(CsvImportException::class);
+        $this->expectExceptionMessage('3 行 : タグ1は255文字以内にしてください。');
+
+        $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/tag-over-length.utf8.csv');
+        $importer->execute();
+    }
+
+    public function testTagCantAcceptJumpedColumnUTF8()
+    {
+        $user = factory(User::class)->create();
+
+        $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/tag-jumped-column.utf8.csv');
+        $importer->execute();
+        $ejaculation = $user->ejaculations()->first();
+        $tags = $ejaculation->tags()->get();
+
+        $this->assertSame(1, $user->ejaculations()->count());
+        $this->assertCount(1, $tags);
+        $this->assertEquals('貧乳', $tags[0]->name);
+    }
+
+    public function testTagCantAcceptMultilineUTF8()
+    {
+        $user = factory(User::class)->create();
+        $this->expectException(CsvImportException::class);
+        $this->expectExceptionMessage('2 行 : タグ1に改行を含めることはできません。');
+
+        $importer = new CheckinCsvImporter($user, __DIR__ . '/../../fixture/Csv/tag-multiline.utf8.csv');
+        $importer->execute();
+    }
 }
diff --git a/tests/fixture/Csv/.editorconfig b/tests/fixture/Csv/.editorconfig
new file mode 100644
index 0000000..c9e4d60
--- /dev/null
+++ b/tests/fixture/Csv/.editorconfig
@@ -0,0 +1,2 @@
+[*.csv]
+end_of_line = crlf
diff --git a/tests/fixture/Csv/tag-jumped-column.utf8.csv b/tests/fixture/Csv/tag-jumped-column.utf8.csv
new file mode 100644
index 0000000..773db36
--- /dev/null
+++ b/tests/fixture/Csv/tag-jumped-column.utf8.csv
@@ -0,0 +1,2 @@
+日時,タグ1,タグ3
+2020/01/23 06:01,貧乳,巨乳
diff --git a/tests/fixture/Csv/tag-multiline.utf8.csv b/tests/fixture/Csv/tag-multiline.utf8.csv
new file mode 100644
index 0000000..ee1bd38
--- /dev/null
+++ b/tests/fixture/Csv/tag-multiline.utf8.csv
@@ -0,0 +1,3 @@
+日時,タグ1
+2020/01/23 06:01,"複数行の
+タグ"
diff --git a/tests/fixture/Csv/tag-over-length.utf8.csv b/tests/fixture/Csv/tag-over-length.utf8.csv
new file mode 100644
index 0000000..891308e
--- /dev/null
+++ b/tests/fixture/Csv/tag-over-length.utf8.csv
@@ -0,0 +1,3 @@
+日時,タグ1
+2020/01/23 06:01,ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
+2020/01/23 06:02,ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooox
diff --git a/tests/fixture/Csv/tag1.utf8.csv b/tests/fixture/Csv/tag1.utf8.csv
new file mode 100644
index 0000000..1d7561c
--- /dev/null
+++ b/tests/fixture/Csv/tag1.utf8.csv
@@ -0,0 +1,2 @@
+日時,タグ1
+2020/01/23 06:01,貧乳
diff --git a/tests/fixture/Csv/tag2.utf8.csv b/tests/fixture/Csv/tag2.utf8.csv
new file mode 100644
index 0000000..10e82fd
--- /dev/null
+++ b/tests/fixture/Csv/tag2.utf8.csv
@@ -0,0 +1,2 @@
+日時,タグ1,タグ2
+2020/01/23 06:01,貧乳,巨乳