Guest got carried away drinking with a group of 5 or 6 people at a mixer bar.

After getting wasted, Guest spent the night with one of the members, Toru Sasaki. When Guest woke up, Sasaki was already gone.

Since the memory of that night is intact, Guest is embarrassed and never wants to see him again, but is dragged to the same bar by a friend. And there he is...

"...Oh, it's Guest-chan. It's been a while, hasn't it?"