It was just announced on members blogs that bassist Runa would be leaving due to personal reasons, and in February of 2012, they will be disbanding. They stated that they discussed continuing on with just four members, but because they didn’t feel confident going on, they decided to disband. They are sorry for worrying their fans and wish them to support them until the end.
No other details are available at this time, and they have not yet announced a final performance. I’ll update when more is announced.
Source: Kyohei’s Blog