Cheat Tensei shita Neko wa Yome no Hiza de Maruku naritai

Synopsis

A cosplayer who lives for games is reincarnated into a fantasy world of swords and magic. He meets a princess there and falls in love at first sight, but... he's been reincarnated as a cat, not a hero! Can the cat save the princess and the world? (Source: Takeshobo, translated)