One Room, Hiatari Futsuu, Tenshi-tsuki.

What will happen when you wake up, and find a cute girl lying next to you in bed? Furthermore, she is not an ordinary girl, but an Angel who comes from Heaven??? Shintarou Tokamitsu is a high school boy living alone. One day, he found a beautiful girl sitting on his balcony. Her name is Towa, but what is her true identity?