Znakey's manga / #Soldier(1)

Read up to end of season 1 - Ch 50 MC is from a modern world with dungeons. One day he gets dragged to another world and forced by a priestess to become a “dark mage” and defeat monsters (can absorb dark energy and use it, but dark mages are discriminated against). Two years later, the Hero party returns and MC tells the priestess to send him back to Earth since the mission is done. The priestess agrees and frees him (from some slave seal?), but before she can remove his powers he attacks her and opens the portal himself. He ends up back in Earth except now dungeons have become much more dangerous and everyone over 21 MUST enlist. He decides to enlist to kill all monsters so that his favorite game company keeps working on his fav game (he’s a huge fan of a character — never cares about real women). Currently the priestess keeps sending monsters to Earth (idk why), and the MC’s cult of dark mages are trying to follow him to Earth (one with white hair succeeded) His love interest seems to be a woman with blue hair, the daughter of a high ranking soldier. She is nice, but I like how the MC squabbles with her and she gets angry and calls him a crazy bastard lol The MC is hilarious. He loves fighting, and he’s a little a shit. Whenever someone mocks him or his favorite game, he beats the shit out of them lol He doesn’t care about women at all, those fists are gender neutral.