After having a nightmare where Hibari kissed him, Kōsaku is woken up by Seiji, an intimidating underling of the Ōzora Group. Ibari sees what he thinks is the two sleeping together, causing him to have a heart attack. Tatsu believes if Hibari were to ever act like a man she would be an incredible yakuza.

Kōsaku has been having erotic dreams about Hibari and the lack of sleep is affecting his health. Ibari warns Hibari to leave him alone only to have another heart attack after Hibari accuses him of jealousy. Honda attempts to seduce Hibari but she rejects him just as Kôsaku and Shiina arrive to save her.

Ibari, the PE coach is in love with homeroom teacher Iwasaki. Ibari decides to turn the house from a Yakuza stronghold into a family home. Yakkun, Boss Crazy's idiot son, attacks the Ōzora house with a tank.

Kōsaku and the Ōzora's end up stranded on a desert island. Ibari has a heart attack when he realises the natives can speak Japanese. They are joined by Kawahana Hiroshi, who makes adventure television programmes. He mistakes them for cavemen, only to be thrown into the river by the real natives.

Suzume's birthday is on Christmas Eve so Ibari plans a party. Hibari invites the boxing club while Kōsaku invites Rie, but she already has plans with Shiina. Most of the characters seen so far arrive for the party, though Ibari chases away the more perverted ones.

Hibari and Kōsaku try to convince Tsubame to date Kaji, but she refuses as she prefers honourable men like Okita Sōji. Kaji's illness turns out to be a Coughing Bug that made Kaji cough whenever he got excited. Despite still being ill Kaji insists on fighting the final round of the match but cheats by claiming he has tuberculosis.