Way to take a series that started off with its cornerstone being fun banter between two sarcastic leads and speedrun it into being just another generic power fantasy isekai. Did the author think we were interested in the cheat skill part of his book? Because trust me, his approach to even that aspect of the story is boring.
What made the first volume work was the dynamic between the two leads. Volume 2, the female lead is reduced to a cardboard cut out, barely essential to the plot, and only there to an enable the introduction of a harem. Sucks when the first volume introduced her as a strong and sarcastic, confident person.
Also, if you're gonna do this whole survival game power, then do something interesting with it? Instead, the skills basically made into a mobile arms factory. Boring, and also...tone deaf? But it's okay, the protagonist "kind of feels bad about it...a little".
The rest of the trappings of our now war time narrative just seem pointless as our main cast simply steam roll everything in sight. And the author, showing all the hallmarks of an inexperienced, young, and generally immature author pulls out exactly what you'd expect to really sell "these bad guys are bad".
Well, there's hundreds of boring isekai out there like this. No idea why this one got licensed to localize into English.