The gang raises money for a trip to France, hoping to keep Hasegawa from getting married. With time running out, the entire University bands together to bring their favorite bondage-gear-wearing grad student back home.
At the Harvest Festival, the Itsuki Seminar's booths are struggling due to Hasegawa's absence, and the Fraternity of the Farm is threatening to shut the operation down. Luckily, Misato and Kawahama have a plan.
As preparations are made for the impending Harvest Festival, Hasegawa starts warming up to the rest of the gang. Complications arise, however, thanks to an agreement she made with her father in the past.
After some aphrodisiac-influenced antics, it's time to face the music. From freshman to grad students, including guys and girls alike, everyone must deal with the awkward aftermath of a very wild night.
Professor Itsuki notices that a lack of female companionship is distracting Sawaki, Misato, and Kawahama. When he gives the guys a bottle of aphrodisiac, the love potion leads to some unexpected results.
Kawahama and Misato's moneymaking schemes land them in hot water, and one more screw-up could get them expelled. Unfortunately, Misato still wants to try his latest plan: using his saliva to ferment sake.