In order to make the relationship between the two close friends closer and more intimate, Ichikawa organized a small party with only the two of them. Of course, the party had alcohol, but both of them drank enthusiastically, so when they were intoxicated, they couldn't control their rationality. Once under the influence, people tend to do wrong, crazy things, and these two were no exception. After a few drinks, desires and cravings started to emerge, leading the close friends to unintentionally cross the line - an involuntary affair happened between them that day.