One Room, Hiatari Futsuu, Tenshi-tsuki.

High schooler Shintarou Tokumitsu enjoys the simple pleasures of living alone in his studio apartment, a quiet haven from the bustling world outside. However, his solitude is dramatically disrupted when he encounters Towa, an angelic visitor with a mission from Heaven, on his balcony. Towa, sent to Earth to study human behaviors, chooses Shintarou as her guide. Despite his initial doubts, Shintarou finds himself agreeing to host her, kicking off an extraordinary cohabitation filled with challenges and unexpected delights.

As Shintarou and Towa navigate their new living arrangement, they face the everyday trials of keeping her celestial identity hidden from the world. The close quarters of the studio apartment test their patience and privacy, yet also forge a unique bond between them. Shintarou’s routine life is turned upside down as he juggles his responsibilities, school life, and the complications that come with having other girls around, all while hosting an angel who is endlessly curious about the human world.