A terminally ill girl named Himari Takakura is miraculously saved from death by a strange spirit who resides in a penguin-shaped hat. However, in exchange for extending her life, the spirit tasks Himari's brothers, Kanba and Shōma, to seek out an elusive item known as the Penguin Drum with assistance from a trio of strange penguins.


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.…

The Penguin Spirit appears again and tells Shōma and Kamba to board a train and find a girl named Ringo Oginome who may possess the Penguindrum. With Ringo attending a girl's school, Shōma and Kamba send in their penguins to follow her.…

As Ringo contemplates making a special curry for Tabuki, Shōma and Kamba, having been reminded about Himari's fate if they don't cooperate, break into Ringo's house to search for the Penguindrum. After just managing to hide from her when…

As Ringo gets help from Himari preparing lunch for a 'date' with Tabuki at the park, Kamba tasks Shōma to go with her and look through her bag for her diary, believing it may be related to the Penguindrum. When they reach the park, they…

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…

Kamba goes to see Asami only to find she has forgotten all about him. He tries getting some information out of two other girls, but they are attacked by Natsume's red balls, causing them to lose their memories. Meanwhile, Shoma…

Tabuki invites Ringo to see one of Yuri's plays with him, followed by dinner, where Yuri invites her and Shoma to a party. At the party, Yuri announces that she and Tabuki are engaged, but Ringo remains determined, dragging Shoma to her…

Ringo attempts to make a move on Tabuki only to find he is not there as his roof had a leak. The next day, Tabuki tells Shoma that he is moving in with Yuri, which does not settle well with Ringo, who later discovers her father consorting…

Himari has a strange dream in which she meets a man named Sanetoshi, who shows her various books containing her memories. In elementary school, she formed a group called Triple-H with her best friends, Hibari and Hikari. When she argued…

Shoma wakes up in hospital with supposedly minor injuries, keeping quiet about what happened between him and Ringo from his siblings. As Ringo explains what happened to her diary to him, Natsume disguises herself as a nurse and kidnaps…

Kanba goes to confront Natsume about the memory-erasing balls and why she desires the diary, unaware that she only has half of it. Meanwhile, Ringo is still determined to complete Project M with or without the diary, making a love potion…

Kanba goes home and is called by Sanetoshi claiming that Himari will die once more. Shoma goes into detail of what happened 16 years ago, as Shoma and Kanba's parents were high ranking members of a terrorist organization and were…

Sanetoshi offers Kanba a special medicine to revive Himari, though mentions there will be a steep price in return. Kanba recalls three years ago when he and Shoma learned about their parents being criminals. Later, Sanetoshi contacts…

Yuri, after breaking off an affair with one of her co-stars, feels a longing for a certain someone. Meanwhile, Shoma is ignoring Ringo, feeling she will never be able to forgive him for what his parents did, and tells her they shouldn't…

Yuri holds Ringo into her room that coincidentally is next to a room Shoma is staying with a classmate on a field trip. Shoma rushes to rescue her after figuring this but he trips and falls unconscious after bumping his head. Meanwhile,…

After realizing that she was tricked by Yuri, Masako reminisces about her grandfather, a powerful business tycoon who expelled her father claiming that he was not strong enough to be allowed a place in the Natsume family. After dreaming…

The Takakura siblings are enjoying Takoyaki together and happy with the news that Himari will soon be released from hospital when the magic hat posesses Himari again for another Survival Strategy meeting with her brothers and insists that…

Tabuki reminisces about how he injured his own hands in despair of being relenquished by her mother as she only cared about his younger brother who was a much better pianist than him. After Tabuki traps Ringo at an elevator and holds…

After the incident at the construction site, Tabuki quit his job and leaves Yuri, while Kanba is praised by his parents for protecting Himari, claiming that once their true objective is reached, they will become together again. Kanba…

Masako decides to leave the Takakuras alone, still not accepting the 'family' they have. As Himari has another conversation with Sanetoshi, Shouma confesses to Ringo that Himari is not actually his blood sister. Years ago, whilst his…

Ringo is approached by a journalist asking about the Takakura siblings, but she avoids him and warns Himari about him. Later that night, Himari, who was told by the same journalist about how Kanba have been collecting money for her…

Ringo stumbles on two girls dressed suspiciously standing before the Takakuras' house and finds that they are actually Himari's childhood friends Hibari and Hikari from the Double-H idol duo. They ask her to give Himari a present in…

On the day of the terrorist attack, 16 years before, Sanetoshi is contronted by Momoka who was determined to stop him and while her spirit ends up split in two with each half becoming the penguin hats used by Himari and Mario, his is…

Shouma tries to dissuade Kanba with no success while Ringo also boards the train, claiming she had learned from the present she got from Himari's friends the secret spell contained into the now lost diary. She activates the spell…
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