Yeah, I just saw that on Hotaru's blog.
That's an OVERKILL project O_o
It is sure a giant surprise they promised for their anniversary
so we got for ONE VN:
-Direction: Hinoue Itaru
-Scenario: Tanaka Romeo / Ryukishi07 / Tonogawa Yuuto
-Music: Maeda Jun / Orito Shinji
-CG: Na-Ga + Shinorii + ? *can't read*
That's quite filled serious business *drools*