Shintarou is a high school student who lives alone in a studio apartment.
He’s trying to adapt to it and make it work, but his apartment is usually a mess, he eats instant and junk food, and he’s constantly exhausted.
One day, he wakes up one and finds something unusual in the apartment balcony, a young woman is asleep.
She wakes up and introduces herself as Towa, and doesn’t hesitate to claim she is an angel who has come down to Earth to learn about humanity.
Shintarou starts thinking she is a bit crazy and tells her he has to leave to work. Towa tell him she has no place to stay and asks him for his permission, but Shintarou prefers to stay away of troubles.
Shintarou and Towa part ways and he believes it is quite deceiving that she claimed to be an angel.
After work, as he walks back home, he bumps with Towa, who is with an older man. He asks her what she is doing and Towa tells him that the old man agreed to take her home.
Astonished, Shintarou takes her back to his apartment, and begins to scold her for being so naive.
Finally, he agrees to let her stay with him, and Towa suddenly shows her wings out of excitement. Shintarou starts thinking he is in a mess, and probably he is.
(ワンルーム, 日当たり普通, 天使つき.)