Is our fate determined by chance, choice, or the intertwined strands of fate? After their sister Himari collapses at the aquarium, twins Kanba and Shoma discover that her death is temporarily reversed by a penguin hat she had asked for. But to keep Himari alive, they must find the mysterious Penguin Drum, which requires solving a complex chain of riddles and untangling the knots of their own secrets and those of strangers and acquaintances. A different destiny must unfold for someone else if Himari is to live. This is a tale of life, love, fate, death, and penguins.