From MangaHelpers:Sagara Soma is a hardcore gamer, who spends basically all of his time playing or thinking about games. Since he was a child, he's thought of how great it would be to really live in a game world. One day, when he breaks a promise to his cousin Maki in order to play video games, his wish comes true. "New Communicate Online," also known as "Neko-Mimi-Neko," is the game he was playing at the time. Neko-Mimi-Neko is well known for its trick quests, occasional unfairly high level enemies, and many bugs, all of which combine to make players die over and over again. Now that Soma seems to literally be a starting character in the game world, will he re-spawn after death, or actually die? Luckily, he knows just about everything there is to know about the world of Neko-Mimi-Neko, so he may be able to make the unfairness in the game work to his advantage. 1r355o
Original Manga:
ComicWalker
Official Translations:
English (J-Novel Club)
9 Volumes (Cancelled)
Chapter 48.2

Isekai with game elements have flooded light novels and are spilling over into manga. A lot of it is trash. Bad art and bad stories full of wish fulfillment are the norm. This is not one of them.
Nekomimi Neko is isekai hell with cat ears. Filled with sadistic quests, world breaking bugs and unstable NPCs, all of which can lead to instant death easily, Soma has good reason to want to flee the game world ASAP. Only through his mastery of exploits and quest lines can he hope to survive in a world designed to fuck over the player at every turn.