It’s a simple story, in itself, a male teenager is becoming a shut-in, his female childhood friend strikes a deal with him, if he manages to come to school, every day, she’ll please him (everything, save vaginal), and actual sex will reward actual highschool graduation.
A man chooses a traditional Japanese guest house instead of a hotel as lodgings for his business trip: that was the best decision of the year. As he will find out, the proprietress needed dick.