Game Chishiki de Saikyou ni Natta Mob Heishi wa, Shin no Jitsuryoku wo Kakushitai

Synopsis:

The toughest soldier turned out to be a mob soldier serving as a gate guard! Silva came to the realization one day that he had reincarnated as a mob soldier from the game he had become addicted to in a past life. He makes every effort to survive in this perilous world by using his game knowledge, but he chooses to conceal his actual strength so as not to complicate matters. But in a surprising turn of events, he was able to easily defeat a giant monster that even the hero had trouble destroying. To exacerbate the situation, he did that in front of his favorite game heroine. Word began to spread about his actual strength after this occurrence...! This is going to be a magnificent tale about the toughest soldier who will sacrifice all for his favorite character!