The sailor heroines fought every day to punish the yokai demon beasts that were the inhabitants of darkness. However, one day, their brains and student council president, Sailor Aqua, aka Momoka, was degraded into evil by the yokai demon Camerada and became Evil Aqua. Desperate persuasion by Yuka, the chairman of the Customs Committee, and her fellow Sailor Volcano are in vain, and Sailor Volcano also falls into evil due to Evil Aqua's scheme. The evil demon's hand was about to extend to the third sailor heroine, Ayaka. ［BAD END］