[Ringo’s](https://anilist.co/character/43334) mother.

Once you make a decision, does the universe conspire to make it happen? Is destiny a matter of chance, a matter of choice or the complex outcome of thousands of warring strands of fate? All twins Kanba and Shoma know is that when their terminally ill sister Himari collapses at the aquarium, her death is somehow temporarily reversed by the penguin hat that she had asked for. It's a provisional resurrection, however, and it comes at a price: to keep Himari alive they need to find the mysterious Penguin Drum. In order to do that, they must first find the links to a complex interlocking chain of riddles that has wrapped around their entire existence, and unravel the knots that tie them to mystifying diary and a baffling string of strangers and semi-acquaintances who all have their own secrets, agendas and "survival strategies." And in order for Himari to live, someone else's chosen destiny will have to change. It's a story of love, fate, life, death... and Penguins! 
(Source: Sentai Filmworks)

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The first film in a duology compiling the Mawaru Penguindrum anime with new elements. 

What would you do to save someone you love? All brothers Shoma and Kanba know is that, after collapsing in an aquarium and apparently dying, their terminally ill sister Himari was somehow revived by a Penguin hat that she had wished for. Now they're on an impossible mission, because the price of keeping Himari alive is to find a mysterious object called the Penguindrum, and they'll do anything to save their sister. Anything. As they travel separate paths in their search, they'll have to unravel complex riddles, make alliances with strangers they know they shouldn't trust, and question the very fabrics of time and destiny. 
(Source: Sentai Filmworks)

Brothers Kanba and Shoma adore their terminally ill little sister, Himari, and aren’t prepared to lose her. They’re definitely not prepared for a family trip to the aquarium, source of many of Himari’s fondest memories, to suddenly turn tragic when Himari collapses and dies. What happens next, however, is beyond the siblings’ wildest imaginations—as Himari miraculously returns from the dead, sporting a penguin-shaped hat, and accompanied by some magical new friends!
 (Source: Seven Seas Entertainment)

Eriko Oginome