diff --git a/microsetta_private_api/model/account.py b/microsetta_private_api/model/account.py
index a42f03ec9..fb54f68e4 100644
--- a/microsetta_private_api/model/account.py
+++ b/microsetta_private_api/model/account.py
@@ -1,6 +1,7 @@
 from enum import Enum
 from microsetta_private_api.model.model_base import ModelBase
 from microsetta_private_api.model.address import Address
+from microsetta_private_api.localization import EN_US, JA_JP
 
 
 class AuthorizationMatch(Enum):
@@ -61,6 +62,8 @@ def __init__(self, account_id, email,
         self.creation_time = creation_time
         self.update_time = update_time
         self.language = language
+        if (self.language == JA_JP):
+            self.language = EN_US
         self.consent_privacy_terms = consent_privacy_terms
 
     def to_api(self):
diff --git a/microsetta_private_api/tasks.py b/microsetta_private_api/tasks.py
index 152c631d3..6e3ef228a 100644
--- a/microsetta_private_api/tasks.py
+++ b/microsetta_private_api/tasks.py
@@ -8,7 +8,7 @@
 from microsetta_private_api.repo.transaction import Transaction
 from microsetta_private_api.repo.admin_repo import AdminRepo
 from microsetta_private_api.repo.qiita_repo import QiitaRepo
-from microsetta_private_api.localization import EN_US
+from microsetta_private_api.localization import EN_US, JA_JP
 from microsetta_private_api.config_manager import SERVER_CONFIG
 import pandas as pd
 import tempfile
@@ -22,6 +22,8 @@
 @celery.task(ignore_result=True)
 def send_email(email, template_name, template_args, language):
     template = EmailMessage[template_name]
+    if language == JA_JP:
+        language = EN_US
 
     with flask_babel.force_locale(language):
         SendEmail.send(email, template, template_args)