1-3. Gaten na Aitsu
The son of the owner of a construction firm is harassed by his seniors in school. His father's live-in worker happens to pass by while he was being assaulted... The story continues in volume 1, chapter 5 of Play Boy Blues.

4. P.B.B.
Shinobu and Junsuke are still living together even though Shinobu quit being a host. Something starts to change between their relationship... The story continues in the series Play Boy Blues.