Giyuu father is Muzan and the mother is a character I made up named Alya the former love piller who lost her life to a demon slayer who thought she was a traitor because she was willing to help a dyeing demon. Giyuu was raised by his aunt and uncle. He want to know more about his parents this would lead to him learning more about himself.

First Naru leaves as if nothing happened. 5 years later he comes back as if nothings changed. He can't of been more wrong. However when he meets Mai again things have become completely different. When they go on a case they realise how much she has changed and how much she's done.