もめっ！乳姉妹かていきょうし11人

Main character is a student who is honest about his desires - he practices voyeurism and eavesdropping targeting the neighboring girls. One day a mysterious meteorite arrives and destroys the house where 11 girls were living. Protagonist suggests his own house as a temporary solution. But just eavesdropping is not enough already. He organizes private tutorship in order to be left with individual girls alone.

[From vndbreview]