- Top brass hired some random guy (gamer) to fill their ranks despite the high cost of the isekai mission (looks like no one cares about the success, poor investors). And they've done it because his name was neat.

- They're also prepared a big remuneration for his sister in case if he dies (can't you just hire an orphan if you don't care about his training?).

- The briefing time was so short, MC failed to remember crucial facts about the other world.

- Isekai (in its true meaning) is a popular subject (according to the story), but MC was absolutely obvious about it except for some negligible points. This is despite the fact that MC is a gamer!

- MC was introduced to his squad a few minutes before the mission start (Nuff said). Squad's leader also refused to introduce everyone before passing through the portal (probability of the emergent situation right from the start? Nah).

- AK 47.

- Rifle in hands of an amateur with zero training and doubtable mental health.

----- end of the 1st chapter -----

The more you read the more glaring plotholes become. How MC handles storage of meds and equipment, how carefree he is, how naively he handles thugs, how lame his combat tactics (though maybe this one is not a plothole since he just a gamer, but even a gamer will try his best when he feels cornered) - everything bad.

The worst is, he was complaining about a short briefing but done nothing to gather the intel on site.

[Due to some circumstances MC got a wife (Rana-elf princess) but he still lets other girls cling to him, literally in front of his wife, even though she hates it. His mental describes how good it feels and how he "doesn't have the courage to push the girls away". He keeps saying his marriage is a sham even though his wife actually treats him like a lover (Sitting on his thighs, letting him feed her, gosh he even rubbed her belly and kissed her). In my opinion, this novel got worse when new girls started appearing and MC became Rito

Note: The first girl who tried to seduce him is the beast girl Lanseal. Why don't I like her? She initially served a horny prince who kidnapped MC's future wife, she didn't outright do anything bad, but she didn't try to stop the prince either. She threatened MC and his wife to help stopping the war (Elf King wants to use the fact that Horny Prince tried to do bad things to Elf Princess Rana to start a war. After MC's wife asserting dominance on MC to stop Elf King from making things troublesome, Lanseal was like, omg MC you are my lover thanks so much for stopping the war, Right. In. Front. Of. His. Wife]

Generation-long curses, forbidden names, Beasts, intentionally erased-histories, alternate universes (and how the MC's universe relates to all this), and conflicts between and within other countries (feels a bit like Overlord-quality in terms of politics here). A common theme seen throughout this story is the weight of lore/history, as past events, even false ones, influence the present.

The MC viewed his marriage as a "sham" due to its political nature. The conflict caused from this view is solved later in the story. His love for his wife is real though, and this sentiment stays consistent throughout the story. In fact, he feel guilty when other girls start becoming interested in him, but this concern isn't shared by his wife (or many others in his adventuring party) as most are familiar with the practice of polygamy (well, there are some who oppose it but in general it's presented as a not-too-serious culture-clash issue).

It's a happy ending