This has been awesome so far, a cut above the rest of the isekai slop (my fav genre), but the part where he is this trained assassin killer but also cries like a bitch over things doesn't really fit. Generally, characters like this are depressed, but they're not whiny crybabies, they're just jaded. It's like the author wanted him to have combat experience and the hardass mafia trained sad backstory that will give him a basis to be this capable, proactive isekai protag, but also wanted him to be the typical Japanese herbivore MC at the same time. Kinda hoping his "I will no longer despair" declaration is for real from now on, because the story so far is cool, and the art is really on point.