As I said the premise of the manga is that everything is dropped from the dungeon, food, livestocks, items, minerals and even money itself. Its a nice and interesting premise and it makes sense when we get a glimpse of the world MC lives: its mostly wasteland and rocky places, there's few forests and other faunas here and there, but all in all humans would be doomed without the dungeons to provide resources to them.
Since humans get everything they need from dungeons that means the adventurer job is always in high demand, of course the humans have other jobs like: Blacksmith, Cooks, Guild Managers and so on, but the majority of the people are adventurers / dungeon explorers.
MC is a typical no-lifer, black company worker that probably died from overworking since it's clear he was forced to overwork very frequently on his previous life. He comes to this world as a "drop" of a girl named Emily (the best girl of the story and one of its best parts).
Thanks to his bad previous life he's very depressed, has a rock bottom self esteem, has a high anxiety and is scared of everything, these problems only worsen when he discover his stats on this new world: he's stuck at level 1 and won't get stronger and all his stats are trash...
... Except his drop stats, they're all S and that means if by some miracle MC manage to kill a monster or deal the finishing blow, he'll get drops with the best quality and in the highest quantity. And so far he's the only person with S Rank drop, the others have A at most.
About MC himself, he's a good man, a gentle and hard working person, he makes the women around him feel very safe and appreciated, he's also very empathetic and always to help people in need.
He's oblivious to romance in the beginning (but later on he starts becoming more conscious of the women around him) and we can blame this obliviousness due to his lack of relationships in the past life coupled with his rock bottom self esteem and traumatic experiences from his black company life (his entire life was spent working).
He's scared people are only around him because he's providing them with something and that when they get what they want, they're gonna toss him aside like his superiors did in the black company and that makes sense based on his previous life experiences...
... Until he meets Emily, the best, cutest, most wholesome girl of the story and the best wife in my opinion. By sheer luck or by some stroke of fate, Emily is the first person MC meets in this new world.
Emily is a poor girl that lives on the first floor of the dungeon, she's a power house herself, but lacks agility and dexterity so she's a bad match up against agile enemies, for this reason alone she's been stuck on the dungeon 1F for a few years slowly trying to get stronger, her drop ranks are bad and all that forces her to become a Slime Slayer to not die of hunger.
In one of these hunts, she manages to "drop" Ryouta from a Slime and after a fun interaction between the two of them, Emily helps Ryouta with many informations about this world and she's the one that helps Ryouta discover his stats and also give him a bamboo spear to kill slimes and discover that his drops skills are the best in the world.
Right after that Emily proceeds to make some delicious food for the two of them and then MC, whose head is already messed up from his previous life, has a emotional breakdown because its the first time someone took care of him and it's also been so many years since he ate food with another person.
This scene lead us to the moment this manga got me invested and cemented Emily as the best girl: Emily quickly embraces Ryouta and manages to comfort him and soothe his sadness, she offers him her kindness and warmth despite them both being completely strange, its no exaggeration to say that Emily saved Ryouta's life with her kindness, because the man was so messed up that it wouldn't be a surprise if the dude offed himself right away.
She quickly became so important in Ryouta's life, the most important person to him I must say, that right after their encounter Ryouta decides to shut himself in a dungeon for 3 consecutive days, with barely any resting time or any food, and kills around 100 slimes just so he can rent a house for Emily live (for her alone, he tells her that he'll pay her rental fee for as long as she lives in that place).
Keep in mind a few things:
- Ryouta is modern human, so that means he's not used to killing or situations of life and death.
- Ryouta is very scared, anxious and insecure thanks to his previous life.
- On top of that his stats are F rank and that means 1 or 2 hits from Slimes would surely kill him.
And yet despite all those factors, he managed to kill about 100 slimes alone just to give a stranger kind girl a house to live. That goes to show how much of a best girl Emily is and how big of impact her presence was on Ryouta's sad life.
Seriously look at this face, look at Emily's cute and wholesome face, this alone is worth a 10/10 rate to the mango.
And after that Emily gets so touched by Ryouta's action that she invites him to live with her and then many wholesome moments happens between them (one of the best parts of the story).
And we follow the story of man and a girl living in a dungeon world slowly climbing their way to live a comfy life, over their course they create new ideas to farm better items or levels (for Emily) or new methods of farm, they also meet many quirky characters and slowly get a more comfortable life thanks to their hardwork.
It's worth a reading guys, give it a shot.