Following his mother's death, high school student Kōsaku Sakamoto moves in with the yakuza boss Ibari Ōzora. He initially believes Ibari to have four daughters, but is shocked to learn that Hibari was assigned male at birth. Everyone at school believes Hibari is a girl because she looks and behaves like one.

Hibari prompts Rie to tell Shiina she loves him while Shiina plans to kiss Hibari. Kōsaku almost reveals Hibari's gender but is stopped by her before he can. Rie asks Hibari to come with her to the baths as she is scared to go alone. Seiji drives the club to the camp, with Hibari and Rie sharing a room.

Suzume invites her friends over for a study session, one of whom she has a crush on. Suzume's friends are initially too scared to enter after seeing Ibari attempting to remove Hibari's female clothing. Ibari puts on a play but the yakuza actors use real weapons so Suzume scolds Ibari.

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.

Ever since he failed to seduce Hibari Honda has become afraid of girls. After seeing Hibari flirting with Kōsaku he decides to try seduce her again. Honda takes a picture of the pair together and spreads the rumour they are dating. Shiina becomes jealous so Honda's friends manipulate them into admitting they are not dating.

Ibari takes Kōsaku to the Women's Wrestling Tournament. Ibari almost joins in but is caught by Chinma, the Wrestling Group President. Chinma asks Hibari to audition to be a wrestler. Hibari outperforms Rie at every exercise before they are paired up to wrestle each other.

The Ōzora family is having money troubles and many of their soldiers are quitting to find real jobs. Ibari refuses to change how he does business but is shamed when he finds a piece of Suzume's homework. Suzume defeats Ibari in a duel and demands to be made Chief Detective.

Ibari has developed a crush on Fumiko, a coffee shop manager. Ibari saves the coffee shop from being shut down by Coffee Ittosai by threatening to assassinate him. Suzume starts acting spoiled so Ibari slaps her. Hibari then offers to marry Ibari to shock him out of his depression.

Hibari and Seiji meet Kaneda Kanesuke, the brother of Kōsaku's mother, Harue. Ibari is outraged on his behalf that his uncle is a no good thief and scares him off. He then falls off the roof trying to escape Hibari's proposal of marriage.

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.