Kizuitara Musou Game no Akuyaku Shogun Datta Ken. Hametsu Route wa Buttsubusu

A man works in an exploitative company, and his only joy in life is playing the hack-and-slash game "Brave of Kingdom" when he gets home from work. But one day, when playing the game, he sees something strange, and the next thing he knows, he is inside the world of the game, with the familiar adjutant character Selina before him in her familiar uniform. He has transformed into the game's evil general Zeorg, with his muscular build and full beard, along with his doomed destiny to be mowed down by the game's hero, along with the rest of the game's mooks. Using his survival skills in his exploitative workplace, and his knowledge of the game, Zeorg is determined to avoid a bad ending.

(Source: Anime News Network, edited)