Only I Know That This World is a Game summary: Due to Souma Sagara's serious gaming tendencies and solitary nature, he dedicates his entire existence to the virtual reality game called "New Communicate Online," also known as "Neko-Mimi-Neko." However, when his cousin Maki fails to tidy up her storage room and inadvertently wishes for something, a magical mallet appears and causes Souma to vanish. As a result, Souma is transformed into a level one player confined within the world of New Communicate Online, where he encounters glitches, dev mishaps, dangers, and an uneven playing field. Nevertheless, since he has played the game for countless hours, he is well-versed in its flawed mechanics and successfully exploits all of its weaknesses.