Koremitsu Akagi is a student who visited Hikaru Mikado’s grave. The tragedy happened in a Golden Week where people enjoyed holidays, but Hikaru suddenly passed away of an incident. Koremitsu has no idea why he came to the funeral as he wasn’t Hikaru’s friend and didn’t even know him well. Soon Akagi starts feeling weird and notices a phantom of the familiar. Mikado didn’t entirely leave this world. He isn’t able to make a promise to his bride Aoi Saotome, so he asks Koremitsu for help as no one else sees him. A student can’t refuse to the phantom. He makes effort to search and collect all the ex-girlfriends of Hikaru to take a responsibility for their problems and fix undermined attitudes.