This is the most cringe and awful manga I've ever read. There is so much messed up with this manga that I actually bothered writing a review for once, just to warn people to stay away from it! *Domestic violence warning* Because this manga has it all: * Female protagonist with huge breasts, very light clothing, and willing to do anything the MC says, calling him master, and her only purpose seems to be explaining to the MC how the dungeon works! Oh, and constantly trying to get in his pants.. * Incestuous undertones with his 15-16 year old family member (Possibly Niece), he's 39 and hadher wear a bikini suit later on.
* MC with God/Hero complex. He's the only one who can save everyone. Everyone else are too stupid and will only get in the way, so he decide to not share any of the things he learned, for free, with the rest of the world. Like how the world is ending in 10 years unless they can beat the dungeons!
* MC hitting a woman to teach her a lesson and make her do as he says, totally justified because the world is at stake! /sarcasm
* MC money laundering because the ends always justifies the means!
* Pushing his alt-right political world views on the readers. Terrorist? Must be religious or leftist groups, according to the author anyway.
* Literally bringing American politics into his horrible story and calling them out by name "Democratic", putting them in a bad light
* Using the manga to spread his disdain for animal protection groups by having a woman enter the dungeon only to try to protect the monsters from the adventurers. She starts rambling some nonsense about ending the far right political government or something. It does not make much sense to me, but the author is obviously trying to portray her as a nuttjob. She has her nose bitten off by the monster only to come to her senses and realize what a fool she's been. Time to get off the internet and touch some grass Mr Author.

That's it for the "warnings" about what you can expect reading this manga. Following this I will write a more detailed review.

The manga seems innocent enough at first glance. With a pretty average title and cover, nothing really standing out.
The drawings in the manga are decent enough and have a good level of details. The biggest complaints I have is how sometimes the body proportions are messed up as they are turning, the eyes feels off at times and there is not a lot of movement to the drawings and the MC has like 3 expressions in total with the "cool collected type" seems to be the standard.

The story in nothing special without one bit of originality at all. Hole in the ground with stairs popping up in his backyard, he decide to check it out and is rewarded with some OP skills like infinite inventory and six skill slots where 2-3 is the norm. Also he gets a summoned lady with a massive chest, skimpy clothes, whose first words is an exited comment about his dirty gaze on her. She quickly proclaims him her master and tells him every part of her body belongs to him. Her main purpose seems to be explaining everything about the dungeon to the people exploring the dungeon, knowledge the MC decides to keep to himself because he's the only one who can save them all. (Seriously get over yourself.) She is mostly interested in getting into his pants or praising him.
She further explains how the dungeon will provide the world with the things we need the most! Namely water, food and MONEY! Yes, the author in his infinite wisdom has realized that a lot of the worlds issues would be solved if we just had a little bit more hard cash! Hear that governments of the world? Just print some more currency and solve all your issues! Inflation? What is that.

This is where she explains that the world will end in 10 years unless all 666 dungeons are defeated! And this is where his Hero complex comes into play. With cringe lines like "the fate of the world rests on my actions, any misstep and it could be destroyed.." and "How will kazuhiko-sama deal with this..? Everything is in your hands!"
He considers calling the police or government but quickly tosses the idea to the side for reasons that makes no sense to me (c.3 page.5) "Even if they believed me, many people would realize the world would end soon"? Translation error? idk
So he does his best to hide the dungeon instead.

Next he takes a well deserved break and has the big chested ninja Akane give him a foot massage, to "test her ability" apparently that's the best use of a powerful female ninja when you have dungeons to defeat and the world is ending. She keeps flirting with him and suggesting they get it on, every other page, because that's apparently all she has on her mind.

The dungeons seems to run by some pretty basic gatcha system, where you collect drop cards and every 10 lets you roll a gatcha for your desired object be it a weapon, item or so. So his master plan is to grind those goblins on floor 1 for weeks and weeks.

Next up we get introduced to a cute heroine called Mari Kinouchi. She's the daughter of a relative who's divorced and struggle financially. That's why the heroic MC has taken it upon himself to hire her to clean his home once a week. He suggest she works a bit for him in a side job, where she jokes while blushing "it isn't a naughty job, right?" A totally normal and healthy talk between a 39 year old dude and his 15-16 year old female relative. Her mom also makes a similar concerned comment when she hears of this side job.
As if having her fight with him in the dungeon was not bad enough.

The next horrible issue our dear MC is forced into is having to get into money laundering to avoid having those nosy government officials question him about where he got all that money from. Making a big point about how he does not really want to do it, but is forced to do it because he is after all trying to save the world and the end always justifies the means. (c.7 page.9)
And if that was not bad enough, this is also the chapter he starts dragging in American politics into his story. At first I thought it was all for fun, but later I started seeing it more as trying to glorify a certain character, though that is more my personal impression. (c7. p16)
Next he shows the Japanese government learning about what is happening. Their first theorize it was a terrorist attack with is logical enough. But the response caught me completely off guard. "There is no movement from any religious or leftist groups" Even if it were. What would be the meaning of such a large-scale operation.." Apparently the author is very interested in spreading his political views.

And if you like me thought it could not possible get any worse, yes it totally can and yes it totally did.
Because in another couple of chapters he gets another summoned girl with a massive chest (Naturally).
In comes "Cheeky Emily", she is.. cheeky. And the MC knows her kind as he's had experiences with cheeky females at his job before! Oh no, what will he do? Use violence to force her into submission apparently! (c.10 page.13) Also threatening to kill her, demand she call him -sama or Master!.. This part made me sick to my stomach and I started seriously regretting reading this pile of junk. And his pathetic attempt at justifying himself after does not make it any better... And before anyone starts with some "It was just one slap" bs, let me ask you this: what was the reason to have this in the story in the first place? To show that it is fine to hit women if you are justified? If you hit her once, you will hit her twice. This is how domestic abuse starts. And they all have reasons and feel justified in what they are doing.

Further on he brings his teenage relative into the dungeon to fight with him, and proceed to have her dress up in a bikini like garb because he does not want to waste gatcha pulls and they need to make due with what they have! (Again, 39 year old guy with 15-16 year old female relative.) (c.13 page.17) And the way the author keeps portraying the MC as the cool and collected, stoic type feels more and more off.

Even when the government has started actively having people train and explore the dungeons he is not sharing anything of the information he got for free. Instead he focuses on a woman who enters the dungeons not to fight the monsters but to protect them from the other adventurers. The whole thing makes no sense to me and is just a horrible attempt at pushing the narrative that animal protection groups are all a bunch of idiots. She starts talking some nonsense about animal abuse in the dungeons, and how "we must put an end to the far-right cabinet" The woman has her nose bitten off by a bunny like monster, which is nothing more than what she deserves according to the MC. (c.15 page.21) She quickly realizes her mistake and apologized to everyone calmly in spite of the pain of having her nose bitten off. The whole thing feel forced and unnatural. And one realize the authors world view is extremely narrow.

That was as far as I could push myself to read this. Which was a real struggle after chapter 10.
And the more I think about it the more I am left with the impression of how negative of a view the author has of women. None of the women in the story has much of a personality, they're mostly good for doing what the MC tells them to. And for sexualizing ofc.. Majority of the government officials and leaders are men. They all dress lightly, and try to seduce the MC.

As for the story itself, it feels like nothing of interest has really happened. And it feels more like the author is busy pushing his political views rather than telling us a story. And everything else in the story he has from somewhere else. The only original parts to his story are the bad ones like hitting women, money laundering and hiding the information from everyone else!

If you want to read a good dungeon exploring story there are plenty out there. From "Is it right to pick up girls in a dungeon?" To "D-Genesis". This one is best left untouched.