like Ardis friends (the ones who are trying to win him over to be their party member)

He is from another world where war is common, and he is currently in his 30s. He was transported after a large war into the current world they live in where they don't teach sword arts, and 1 year in the world is also about a month in his original world. He's in his 30s in his original world, but for some reason, his body changed to the immortal body of a child. He was raised and ab*sed in an underground facility in his original world where children were locked up, and he managed to escape and become part of a mercenary squad. Here, the author expands the world of the mercenary largely, as something desperate, needed, and brutal. It's a world where you can either kill or be killed. It has some extremely brutal war moments, betrayal, decapitation, gore, and essentially shows how Ardis learns to adjust and become a real mercenary. He is trained as a colder person, forced to even kill children on the battlefield, even if he's far from his current self in terms of how easily he can kill people. He's part of Westeria, a wholesome, and connected band of mercenaries who are doing what they can to survive. There's infiltrations, s*xual ab*se, and mentions of r*pe often shown as common in mercenaries, but Westeria is against all of it and they're essentially all a family. He's far from strong at all in the squad, but he makes his way closer to the top. It's wholesome essentially, and he has a great love relationship with a girl named Luciel who he rescued from the facility they were kept in as children. However, everything goes wrong once a prodigy brutal and cruel woman general decides to go around hiring mercenaries and treating them as disposables for her plans. It angers Westeria, and it causes their downfall, as she consistently does whatever cruel tricks she can to lure them in and kill off half of their entire squad in their first battle where Ardis and Luciel learn that she runs the underground facilities with captured children. Ardis and Luciel try to save them, but Luciel essentially gets captured when Ardis is unable to come, and Ardis learns that she was essentially tortured and r*ped for years by some former mercenaries of Westeria who were kicked out and hired by the woman general. From there, it all goes to hell and Ardis is forced to kill Luciel when he finds her shackled and unable to escape. The backstory is still continuing on..