Because he's too kind, Kominami always suffers from unfortunate incidents. On a rainy day, he finds a drenched young man sitting slumped in front of his home and can't help but talk to him. He seems to be a college student living in the next room, troubled by the loss of his home key. Kominami can't just let him go and invites him into the house, but he's shaken by the inexplicable sense of closeness——!?