This is certainly a horrible piece of news. Daisuke (who had been busy recently with his solo project 大佑と黒の隠者達 (Daisuke to Kuro no Injatachi), but also was a vocalist of the studs and previously 蜉蝣 (Kagerou), has passed away today, on July 15th. Here is an announcement posted on the English official website of the studs:
To the fans and affiliates,
We regret to inform all fans and affiliates that Daisuke was laid to rest on July 15, 2010.
In respect of the wishes of his family the funeral procession will be carried out with his closest relatives only. We thank you deeply for all your support for Daisuke up to now. Our utmost and heartfelt condolences go out to everyone.
Our hearts go out to Daisuke’s family, friends and fans. May he rest in peace.
Source: the studs’ OHP, vkdb