
They are in the in 21st century, right? So why don't they use guns and stuff like that on monsters? I don't know If I missed something but I like to know that.

If u further read the novel.....
(Spoiler)
When japan is invaded by S rank monster, only leave with military to fight....(since most their Jap S rank hunter dies)... They try to fight with guns and all but futile.
Not even a dent to those monsters.
Monster also have mana, so I'm guess the skin is harder than earth animals.
So the author put it (using guns) but guessing unless is imbued with mana,is like hitting animal with sticks
╮( ̄▽ ̄)╭

It's just like another fantasy manga.
Following magic logics,
You need to fight magical creatures (monsters) using magical weapons.
That's why normal weapons like gun, bomb, etc won't work on them.
You need to fight them using weapons imbued by magic.
Just like in the previous chapter, electrical devices won't work inside the dungeon, that's why they use pickaxe imbued by magic to mine magic ores and pure strength to collect monsters.
Creating magic weapons are not easy either because you need to get their materials from higher ranker monsters or ores from dungeon.
Hope it helps.
Did he pass out b/c that was too much excitement for him to take??
I think since he's having sleep sex he just went into a deeper sleep.
Dogg, there's no such thing as "sleep sex" he was wasted, busted a nut and took a nap lol.
Um, the whole basis in this story is there is a condition where people have sex in their sleep. It's like sleep walking.
That's not the "whole basis of the story" that's just what he assumes. 1 answer actually makes sense and the other is the dumbest fucking thing I've ever heard lol.