Heat (MIYAMOTO Kano)

About a small agency “that does everything". The manager has a very special tattoo and an affinity for smiling faces. Customers approach the manager with difficult problems and he solves them, with the fee for his services sometimes being paid with sex.

Miyamoto Kano's "Walker" universe timeline:
1) Are You Enemy?
2) Not Love *licensed
-- Not/Love dj - The reason why we live together
-- Not/Love dj - Dog Days
-- Not/Love dj - Demonic Conversations
3) Heat (MIYAMOTO Kano)
4) Under the Skin

the ones on ( -- ) are doujinshis..they give background or "add into" to some key points in the main story line. So you're not really missing anything even if you don't read it.