Kaleidoscope ~Mangekyou~

Shogo decided to spend university summer vacations doing a part-time job. He gets a job in Kodoin family mansion where a doll-like girl with emotions closed to the world lives. Shogo manages to gradually return here to senses and gets involved into a plot to claim family's heritage. At the same time Shogo's girlfriend visits the same mansion as tutor. How will Shogo settle all that?

[From vndbreview]