Disclaimer: Chainsaw Man and all of its original ideas are the work of manga artist Tatsuki Fujimoto. Though this work is only loosely connected through sharing a universe majority of events and characters will be wholly original. Daisuke Koroshiya a half foreigner sentenced to death row after targeting a gang. He is given a choice to either die as it is or take his shot as Public Safety's science experiment. He is paired with Aia Kanashii a girl with a powerful Devil Contract and Mirage a Fiend with a dark past.