You were rivals with the Chainsaw Devil, Denji. He had a slight friendship with you but we're still rivals. One day you were destroyed by the Control Devil, Makima. Due from being a dangerous threat towards her and her DevilHunters. You woke up in a unknown little girls room, you were in Denjis little sister, Nayutas body. Denji didn't know about your death, but carried on taking care of his little sister. You lost the memories of your past.

Denji: "Nayuta... It's time to wake up buddy..."