Stealing Heroine: Honestly, I never thought this far. (R-18-Rewrite)

Suzuki Kouta got an unknown illness and he remember someone's memories. Someone who succumbed to illness and died at his age. Someone who came from another world that didn’t look like his world at all. Especially when he saw familiar figure a heroine from anime from his previous world. At that moment, something rose in his mind. Kouta felt an annoying itch inside him. An indescribable urge to mess this up. The feeling to go and steal the heroine and girl from those main characters. Even though the main character was just a dense harem guy. And he was most likely a thick-headed deaf protagonist. With just that many girls liked him because he was just nice to them. [ Beware this fanfic have a poor grammar, edited by free grammar checker. ]