The schoolgirl Mitsuki suddenly gets a stepbrother of the same age because her divorced mother marries again. The new husband brings his son Yuya into the family. When the parents are abroad for a few weeks, Mitsuki is haunted by the ghost of the deceased Hiyori, who was in love with Yuya during her lifetime. The ghost is trapped in this world and can only reach heaven when Mitsuki masters a delicate challenge: she has to seduce her stepbrother Yuya. Sexy fantasy comedy about a schoolgirl who is pushed by the ghost of a deceased girl to seduce her stepbrother. Based on a manga and anime by the popular Japanese illustrator Mari Matsuzawa.