I was reincarnated as a monster in a game world
MangaDexSynopsis
Before I knew it, I had been reincarnated into the world of a game I played in my previous life. As a monster, and in a hostile relationship with humanity! I had no choice but to live quietly so that humans wouldn't find me, but... I found my favorite heroine, Noah, collapsed near my home! After I protected and cared for her, she named me "Rei". So I decided to protect her for the rest of my life and follow her. I met other characters from the game and watched Noah grow up, but the real Noah seems to be a bit of a spoiled brat and a bit of a doting type... This is the story of how I, who was reincarnated as a monster, overcome all sorts of difficulties together with my favorite heroine.