Clock Zero ~Shuuen no Ichibyou~ the otome game is getting a live-action theatre show/adaptation （舞台化＝theatre-fied） [Official Site] EDIT: so is another game called Toki no Kizuna [vndb.org].
There is another one called Hanayaka Nari, Waga Ichizoku [vndb.org] [more info] that got a theatre show earlier this year.
I actually own a copy of Clock Zero but have not gotten around to playing it yet XD. It’s only available on PS2 or PSP I believe and it was first released in 2010.
Some screenshots from Clock Zero: