One Room, Hiatari Futsuu, Tenshi-tsuki.

Tokumitsu Shintarou is a high schooler living all alone, but things take an unexpected turn when a girl named Towa shows up on his balcony! Not only is she incredibly pure and sweet, but there`s something different about her—something...divine. Just who is Shintarou`s new roommate, and what adorable high jinks lie in store?!