Three siblings, Shōma, Kanba and Himari Takakura are living together, despite the fact Himari was given only a few months to live by the doctor. The three visit an aquarium to see the penguins, where Shōma buys her a queen penguin hat. However, Himari collapses and later dies in hospital. As the brothers mourn, they are surprised to see Himari suddenly spring back to life and cured of her condition, possessed by a spirit which has decided to extend her life, though she returns to normal when her penguin hat falls off. The next day, the siblings receive a shipment of frozen things, which are later revealed to be a trio of strange penguins that no one besides them can see. Just then, the hat possesses Himari again, explaining that she has extended her life but in exchange wants the brothers to obtain something known as the Penguin Drum. As Shōma sleeps that night, Kanba ends up kissing Himari as she sleeps.

Asami Kuho, the girl who was pushed down the escalator, is questioned by a woman named Natsume, who then fires a red ball at her head, causing her to remember nothing about the incident. Kamba hears that his uncle is planning to sell their house and goes to see a strange person to obtain the money to buy it. Meanwhile, Shōma and Himari find Ringo, who had a bad day, and invite her back to their place. There, Shōma asks Ringo about her diary, which she claims is a Diary of Fate which describes her future. Both she and Shōma are summoned by the Penguin Hat, who orders Shōma to retrieve the diary, but Ringo breaks free and throws away the hat which lands on a truck, causing Himari to fall dead again. As Kamba goes to retrieve the hat, he recalls what happened 9 years ago when he went with his father into a typhoon when Himari was ill with a fever. After a tough struggle, Kamba manages to retrieve the hat and return it to Himari.