1-3 & 5) Naisho de Alleluya
Shuuichiro Ooka (a.k.a Shu) is a famous song-writer 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 who Shu slept with before that goes by the name Umekichi!
Botan also appears in Emono no Kimochi.
4) Boku no Kirei na Hito Dakara
Not scanlated.
6) Afterword.