No, our tech support are only available on our business hours:
Monday - Friday (10:00 am - 19:00 pm JST). Our offices are closed during weekends and Japan national holidays.
However, we have a WordPress support service for enterprise you may consider: Yojinbo.
Yojinbo is a WordPress enterprise support service on annual or monthly plans. Depending on the plan, support response time can be within 3 business days, within 1 business day or within 12 hours.