This contains two short stories, one about Bun and a new kid he's found to replace Satoru from Heat; the second is a look at Bun and Daisuke

Miyamoto Kano's "Walker" universe timeline:

1. Are You Enemy?
2. Not/Love
   – Not/Love dj - The Reason Why We Live Together
   – Not/Love dj - Dog Days
   – Not/Love dj - Demonic Conversations
   – Not/Love dj - Brand New Lover
3. Heat (MIYAMOTO Kano)
   – Under the Skin
   – Lizards, Angels, and Daemons

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.