The after-party started at Yamaguchi-kun's place. The three close colleagues from the same year got excited, still not having had enough to drink. Emboldened by alcohol, their talk turned lewd, showing a youthful vigor that could be chalked up to the folly of youth. However, once Naruse-kun dozed off, Yamaguchi-kun and Ishikawa-san started acting strange. It turns out the two were already in a sexual relationship, and despite Naruse being there, they got turned on by memories and started going at it...!