The night of his brother's funeral, Tokio Kasuka interrupts a young man in the act of stealing his brother Hajime's ashes. The man, Kuroki Ren, claims to have promised to go on a trip with Hajime, and asked for his bones so that he could take them on the trip instead. Tokio, intrigued by him, agrees to lend a bone to him, under one condition... (Source: MU)