A story about Hotaru and Yuuka, two schoolgirls who used to be childhood friends, that make a club for just the two of them. They spend their after-school time together, both harboring feelings in secret.
Zirui, who lives alone, takes in a dying black cat. One rainy night the black cat suddenly 'bad-mouthed' Zirui. The next day, the black cat disappears and at the same time, a cat lady who resembles the black cat appears in Zirui's bed ......