Chainsaw Man Manga & Chainsaw Man Anime Episode 4 revealed Aki Hayakawa’s first use of KON to save his Brother Denji. But it brings lots of questions regarding some of the characters and what impact they have in the story. We go over Aki Hayakawa and his tragic story because of Makima, from beginning to end! Aki is Denji’s brother in some way and he sacrifices everything for him in his thirst for revenge against The GUN Devil. Denji genuinely cried for the first time because of Aki Hayakawa, Denji vs Aki changed everything.