"Reincarnated as a sub-character of a video game that I used to play!?"

After saving a girl and then getting run over by a car in the process, and "I" was reincarnated as"Rex" in a video game world. A handsome Rex with skills in all fields, but he is a helper character in the early stages. Tho Rex has a high level, balanced skill set and multitude of abilities…He's useless in the later stages of the game!!

I decided in the face the fact that I'm useless in this fantasy world

So let's relax by letting the main character of the game do both "saving the world" and fighting for his life against monsters"!　

This is a story in which an ordinary person looking for a "hero" but instead becomes a hero who saves the world for some reason!

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.