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

One day, Silva realized that he reincarnated into a mob soldier from the game that he was hooked on in his previous life. Even though he utilizes his game knowledge to do his utmost best to survive in this dangerous world, he opts to hide his true strength in order not to throw the scenario into disarray. However, circumstances beyond his control begin to threaten the careful balance he's maintained between his hidden abilities and his role as an ordinary soldier. As he navigates this treacherous world where demons and heroes clash, Silva must decide how much of himself he's willing to reveal to protect those he cares about. A heroic fantasy about a reincarnated gamer who must carefully balance his past life's knowledge with his current world's dangers is about to unfold! (Source: Futabasha, translated)