Natsume Tomoharu may be a normal high-school student in every way with one exception: he’s being followed by the ghost of his ally , Misao.
After getting into his brother’s old house, Tomoharu expects to continue living his normal life but is at some point left with a mysterious and locked briefcase with none instruction. initially he plans to go away it in storage; however, his home is soon invaded by multiple groups of individuals after the briefcase. Although still not knowing the aim of the briefcase, Tomoharu and Misao plan to escape with it.
From there on, Tomoharu tries to find out the secrets behind the briefcase, the connections between it and Misao, and why it’s the facility to vary the planet .