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News

2026.2.24
【Notice of Temporary Service Suspension due to System Migration】
Due to the system migration, some services will be unavailable for approximately one week starting Monday, March 23, 2026. We apologize for any inconvenience this may cause and appreciate your understanding.

Affected Services:
  • New membership registration
  • One Harmony account sign-in
  • Member-rate reservations
2025.12.15
Notice of Program Revision
2025.10.15
Extension of One Harmony Points Expiration Date.

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Contact Us

One Harmony Office

+81-3-6402-3388
Inquiry Form
F. A. Q.
9:30-17:30 JST
(Closed Saturdays, Sundays and Holidays)