Fourteen-year-old Sanda leads a sheltered life - at least until his classmate Shiori demands that he admit one thing: that he is Santa Claus reincarnated. He is supposed to use his superpowers to help Shiori find her missing best friend. All he has to do is put on a red sweater to transform into his true form. Sanda initially thinks it's a bad joke, until Shiori pulls out a knife. Blood also turns clothes red...