A full-length movie recap of the Maison Ikkoku series that focuses on the relationship between Godai and Kyoko. The entire special is taken from footage of the TV series.

Yagami comes to Maison Ikkoku, not knowing of Godai's and Kyoko's wedding, stating that she is now an adult, which she is, not knowing how to tell her, they panic, but she finds out in the end, and is heart broken.

Hyōtei Gakuen's strange (but impossibly wealthy) captain Atobe Keigo decides to throw a giant party for his friend and teammate Kabaji. He invites both friends and rivals. Together they participate in many different sports and events: dancing, swimming, soccer, a relay race, a haunted house, and more.

The regular players from Seigaku participates in an exhibition game aboard a cruise ship. However, they discover that the event is being run by a corrupt millionaire heavily involved in illegal gambling and betting, who demands that they lose the match on purpose. To add to the confusion, one of the players on the rival team introduces himself as Ryoma's brother.

Lum & her girlfriends are invited to Neptune by Oyuki. There she shows them her new business venture at a ranch of flying sherbets, birds capable of producing sherbet cones from their beaks. Ran convinces Oyuki to let her borrow one, her goal is to make some quick cash selling sherbets on Earth. Unfortunately, the combination of being overworked and a hot summer day has made the sherbet extremely cranky, even from its refrigerated cage. It breaks from its cage and escapes, but not before attacking Ran and Lum, and trashing Benten's brand-new bike by shooting sherbet cones at it. Now it's up to Ran to retrieve the sherbet before Benten blasts it out of the sky, and more importantly, before Oyuki finds out.

Ten gives Ataru an alien disease, the contagious "Girl Measles," (which makes the victim's eyes turn big and twinkly, like the eyes of young girls in much of manga and anime), and when Ataru's girl-hunting spreads the virus all over Tomobiki Town, chaos ensues!

Mendou recounts an old story that warns, “Don’t take pictures in front of the statue of Great-Grandfather’s Goat, or terrible things will happen!” When his father does just that, only Sakura and Onsen-mark the Teacher can ward off the horrifying consequences of an ancient family curse… or can they?

It seems that Lum's grandfather made an agreement that should he have a daughter, she would be married to a traveling merchant that he met. Now, the merchant has come to collect due. Ataru is tricked into thinking that Lum wants to leave, and so, in a moment of anger, says he hates her. Arguments erupt, and Lum decides that she must know the truth of Atarus feelings. As for all the questions of importance for the Onis, a game of tag begins, one that Ataru can win simply by telling Lum I Love You. However, in the end his pride may end up dooming him. So begins the series of events that will at long last decide the future and fate of Ataru and Lum.

Lupika, an alien princess, is in love with a tofu seller. To make him love her too (at least, announce his love. He obviously fears the social taboo of a tofu vendor marrying a princess), she needs to get a love potion, which is in a certain temple. Legend has it that the only person that can obtain this love potion is the most lecherous man in the universe. That man turns out to be Ataru Moroboshi. Lupika kidnaps Ataru to make him get the potion, and Lum and her friends go out to search for Ataru.

Lum, Ataru, Mendou and Shinobu visit an inn which Ryuunosuke and her father have opened. But when it turns out to be on a haunted desert island, the stage is set for some serious silliness!