Start living together with an elf!? One day, Eiichi Oribe, a young man with no job and at the bottom of his life, picks up a mysterious stone in a park and suddenly it lights up!? When he opens his eyes, he is sitting on top of a huge tree, holding a beautiful elf woman in his arms. It was! Eiichi tries to help her as she is weakening, but she falls from the tree and loses consciousness. When he wakes up in the hospital a while later, he finds Kurokawa, who calls himself a public security guard, and Tia, an elf. What was revealed there was a shocking truth...and then a sudden confession from Tia!!What will be Eiichi's fate...?