The Diary of a Crazed Family

Ouka stumbles upon a "young girl" stealing an apple one day, per chance, to find himself part of the "Cozy Family Operation" - a top secret mission, in which he has to take the place of father for an abnormal family, in order to find the child of Enka, who is destined to destroy the world.

While Kyouka is busy dreaming about the perfect wedding for her and Ouka, Yuuka is having a hard time fitting into school. In order to resolve the problem, Kyouka jumps into a mother's shoes, and so, in the middle of Yuuka's gym lesson, the frenzied family perform a short play, and successfully make Yuuka appear like a magical girl. Meanwhile the culprit behind the bullying is revealed.

The bullying is yet to cease, and so, Yuuka comes home crying one day, to be comforted by Ginka. The family express their concerns, especially after it appears Teika and Hyouka are ready to do some serious about the situation. The next day, Yuuka is confronted by a teenage girl - her biological sister, Senko, who has come to take her younger sister back. The truth regarding Yuuka's previous family is revealed - her family traditionally tortures the youngest daughter - Yuuka - for being a demon. Before the situation gets out of hand, Ginka appears, and apparently knows Senko. Night comes, and the bullies are at it again, this time aided by Senko, who is madder than ever before, claiming she needs to be saved too. Ginka's second arrival spurs this, as Senko wakes up in the Midarezaki household. Kyouka threatens to kill Senko for being an enemy of the family, but Ouka jumps in and pulls her away.

Kyouka discovers that married couples go on honeymoons prior to their marriage, and so, begins to book one, with help from Chika, who sees it as an opportunity for her and Ginka to get together.

Kyouka builts an airport outside of the Midarezaki family household, so the family can head off to the honeymoon without too much fuss. The family become good friends with a boy nicknamed "Pierre", however, their hotel resort is dangerous, and thus, Yuuka is kidnapped by a group of evil monkeys.

The family, in an attempt to save Yuuka, entice the monkeys of the island with free food and a huge party, while Yuuka becomes friends with the mad doctor of the island, who later turns out to be one of Hyouka's many creators.