Predictable.. :D
Mind... the best fun is to be had reading here with all the grouching about the particular tropes the author uses having no internal logic...
They don't. They never have.... They're just a lazy vehicle to Make Stuff Happen. Asspulls to make the plot "plausible" so that Plot (...
You forgot the 2 mandatory powerups, spreading the battle out over 6 chapters, and have a .5 chapter with a humorous/ecchi omake in between them....
Ith Thradhithion, Marther!!!!
Not the "ruin everything" fruit.... the "create a world" fruit...
Which created world some wannabe's nicked, and majorly messed up.
Basically "The Sorceror's Apprentice" plot.
Yup.... Magic™ stops bullets but not arrows.... Also Fireballs have effect, but not HE/shrapnel shells. A couple of well-placed Claymores cannot decimate hordes of gobbo's, but a single small group of half-trained highschool swordfighters can decimate 100's of them with Battle Spirit, the Power...
Given the title-tag combo.... yeah...
Or it's just your average Dungeon Crawler/Slice-of-Life where the ratio is just there to "explain" why the MC has an all-female "harem" party... As opposed to all those others where there are plenty of capable males around, but all the females still gather...
The usual Holes in Technology/Culture that your average highschooler/sarariman can fill because ...... Because!! FeelGoods!! The Power of Brilliant Sararyman Corporate Training!!! Superior Nihon Street Food causing Foodgasms!!
The author is just using a slightly different mix of the same old...
More a question of what LN...... The source material ended/hiatused out quite a while back...
I think they've even ran out of any plot/development notes and scribbles the author had by now..
Or a variant of the "PleaseTellMeHowYouManagedToGetThatHaremParty" trope..
This does seem the type of manga where the Hulking Giant does the Dogeza for the "secret" sillyness....
"Adult" doesn't necessarily mean "child", or "uneligible for Cuddles™".
It's simply an age, often quite arbitrary, where you can expect someone to have racked up enough experience and lost enough Teenage Stoopidity™ to be taken seriously.
In most human cultures that'd be somewhere between 25...
Looks like MC will have another Willing Slave....
One out to extract every ounce of Revenge she can get out of sticking with MC....
She can't do much about the slavery status, but her goals align quite nicely with MC's...
But boy... Looks like when she gets half a chance she'll grind the...
So..... the Baddies™ are the usual Fanatics herding petty Bruised Egos... check....
So.... You'll Free the World by choosing a method that causes the maximum possible collateral damage amongst people who can't defend themselves.... For Their Own Good... check...
And the New World Order...