Hi there,
Welcome to the Atlassian Community! I hope you don't mind me answering in English 🙂 If you prefer your issue be handled in Japanese, I encourage you to raise a ticket at https://trello.com/contact. My colleagues would be glad to help you!
To address the problem with notifications, could you please specify if you're having trouble with email notifications or the ones that come through the notification center (the Bell button in the app)?
Also, are you not receiving notifications when other members mention you in a card or are you expecting to receive notifications about any updates on a card?
If it's the latter, could you please check if you're Watching the card in question? You can also check this article for more information about Trello notifications: https://support.atlassian.com/ja/trello/docs/receiving-trello-notifications/
Let me know if this resolves the problem!
Alina | The Trello Team
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