Boukenka ni Narou!: Skill Board de Dungeon Kouryaku

Synopsis: I wanted to tell a story in a game world but I didn't want to actually build the world.

The Issue: The story is a gamer world story with levels and skills set in the modern world. Dungeons appear in the real world and now people go dungeon crawling with medieval weapons and armor. There is magic or the tablet ht MC gets would not work or have the "gamer" effect it has on him. We see that Japan still has a modern military as they show up to the MC's house when the dungeon is discovered. We know they still have gas and electricity as we see working card and the MC using a computer. We know there is an internet as we see the MC using it said computer. Yet people go dungeon diving using gear from the middle ages.

The best lame excuse I heard for this is that Japan does not have a lot of guns.

Why this is an issue: It is a plot hole that kills the suspension of disbelief. AS a manga/Anime fan going on 30yrs I can accept a lot of Manga/Anime logic. This is not one of them as it is nothing more than the author being lazy.

"Suspension of disbelief, sometimes called willing suspension of disbelief, is an intentional avoidance of critical thinking or logic in examining something surreal, such as a work of speculative fiction, in order to believe it for the sake of enjoyment." - https://en.wikipedia.org/wiki/Suspension_of_disbelief

Dungeons have invaded the modern world so rather then salarymen we got adventurers. The main character finds himself with a convenient cheat that helps him get stronger but his lack of presence makes it hard for him to interact with others. This leads to some comedic situations. You get the typical dungeon crawling you'd expect from this genre but something happens along the way the kind of ruined the story for me. Light spoilers pertaining to the events that occur in chapter 16.

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This happens during a rescue mission when a group of adventurers ambush the mc and his party(two girls). One girl gets slashed by a sword while the mc and the other girl are at a stand off against an archer and the other adventurers. Oh did I forget the mention the girl who got slashed is also about to be raped? This all happens because those adventurers find it to be fun, which begs to question how many times before have they done something like this. But before that happens monsters swarm shows up which allows the two girls to get away. Those adventurers claim everything was a misunderstanding so the mc decides to stay and help them fight off the wave of monsters. What kind of stupid naive crap is that? Murdering and raping gets chalked up to a misunderstanding so everything's all hunky-dory.