System maintenance notice on December, 2021

System maintenance on our service is scheduled as follows. During the maintenance period, our service will not be available. We apologize for any inconvenience caused.

Maintenance period:
from 10:00 a.m. to 6:00 p.m. on Sunday December 19, 2021, JST

Future maintenance plan 

Sunday January 23, 2022

Sunday February 20, 2022