Naisho de Alleluya

Shuuichiro "Shu" Ooka is a famous songwriter and a father to Botan from a failed marriage. Botan is lonely and asks if he can have a cat. Shu tells him no, but Botan brings one home anyway… a very human-looking cat who is actually a man whom Shu slept with before, that goes by the name Umekichi!