I'm not being argumentative here. I just wanna provide my thoughts on the situation because I grew up with violence every day and I might be able to shed some light on some contention about how the MC reacts.
This makes sense to me. It was repeated that MC lived a pretty good sheltered life before coming into the new world. The most violent thing he experienced is rugby, so for him to be affected like he was makes total sense. Even after months of training, taking a life in CQB would be jarring to someone like him. If he grew up like I did, then I could see the argument that the affect on his mental state wouldn't be as bad.
On a side note, soldiers don't get that much training in USA. I realize that the USA isn't the only western nation, so you might not be talking about us, but our soldiers are usually considered better trained excluding special forces. Those people, no matter where in the world, get massive amounts of training comparitively. 3 months of boot camp for USMC which has the longest boot camp in the US armed forces by double the amount of the Army which is 1.5 months long, which is the second longest boot camp in the US armed forces. Then comes ITB (Infantry Training Battalion). That can be longer depending on your MOS (Military Occupational Specialty), because you're learning your specific job. Your estimation of 6 months of training is close depending on what your MOS is, but ONLY if you explicitly talk about Marines. Any other branch, there is a high probability that they didn't get that much training. You said soldier, which in USA speak, means Army. USMC makes Marines, US Army makes soldiers, US Navy makes sailors, and US Airforce makes....well not just pilots and mechanics. IDK what they make. Military members who consider bicycle riding as PT (physical training)? OK OK OK. I can't be that harsh to our flyboys. They make the best damned pilots on the planet....you flyboys happy now? Real talk, air support is essential to ground forces. I appreciate every pilot in the US military.
Hopefully, if you weren't talking about US armed forces, you view this little tangent as a learning opportunity (which is what it is intended as) rather than seeing it as American ego. Maybe this info can help you in the future.
BTW Dev, the harem tag isn't implemented yet but in the planned section, so does that mean that if I choose a girl, I'm temporarily locked out of the others?