Manga in which main character is a Demon Lord/ Has a Dungeon.

1. Maou Ni Natta Node, Dungeon Tsukutte Jingai Musume To Honobono Suru.

Before I realized, I had become the guardian of a dungeon, a Demon Lord. I was suddenly in a dangerous world with giant monsters loitering around, fighting for their existence, so I thought to go about developing the dungeon in order to not die but —- for some reason I was having quite the good time…. How did it turn out like this?

The protagonist, Yuki, having to live in that world now, uses his bold and sharp senses and spends time with a supreme dragon girl and a vampire girl; Sometimes laughing, sometimes being angry, passing days doing what he likes.

2. Shijou Saikyou No Daimaou, Murabito A Ni Tensei Suru.

The greatest demon lord in all history, Varvatos, has reigned for several millennia as absolute ruler. Now, there's only one thing left for him to do... enjoy the life of an average commoner! When he reincarnates as a villager in an unspeakable city, everything seems to go as he expected, but there's just one small problem: even when he restrains himself, Varvatos is still too strong! In a short time, rumors about him spread, and now, all sorts of men, women and assailants are approaching him! The quiet life I'd always dreamed of seems so far away...

3. Maou-Sama Retry.

Oono Akira, a working adult that can be found anywhere was transported to a different world while logged into a character known as the “Demon Lord” a game he manages. There he meets a child with a disabled leg and they begin to travel together, but there no way that others will leave a “demon lord” with such overwhelming strength alone. While being targeted by countries and saints that are trying to subdue the demon lord, they cause turmoil wherever they go. Demon lord on the outside, normal person on the inside, a misunderstanding type fantasy!

4. Isekai Maou To Shoukan Shoujo Dorei Majutsu.

An elite but socially-stunted gamer finds himself in another world, inhabiting the body of his character Diablo. But despite his powers, his awkwardness keeps getting in the way–so he decides to pretend to be a Demon Lord and soon finds himself with a pair of slaves: a well-endowed elf and a cat girl. Together, they struggle with everything from interpersonal relationships to diabolical beast battles!

5. Maou-Sama No Machizukuri! ~Saikyou No Dungeon Wa Kindai Toshi~

Beings that create and control monsters and demons, beings that build and reign over malicious labyrinths, the chosen individuals to possess an overwhelming Unique Skill… They are the Demon Lords. Demon Lords entice people to come to the labyrinth they’ve built and eat the people’s despair as their nourishment. However, Creation Demon Lord Procell has decided that he will obtain people’s hopes and not their despair as nourishment, and built a happy town instead of a malicious labyrinth to collect human beings. This is the story of an eccentric Demon Lord, with all its ins and outs.

6. Dungeon no Maou wa Saijaku!

God left a dungeon in the hands of a boy known as the Demon Lord. After receiving multiple blessings from God, let’s start my life as a Demon Lord! …Or that’s how it was suppose to be, but God messed up and created the worlds’ weakest Demon Lord ever. To continue living, I have to continue making dungeons.This story is about an idiotic protagonist, a lonely demons’ child, an Undine who lives in a bathtub, and a princess who fell in love with the Demon Lord, even though she was human. A story that all unfolded during a bath.

7. Hisshou Dungeon Unei Houhou.

One sunny leisurely day, a woman visited my house and asked me if I were interested in managing a dungeon along with support from a goddess. But of course, I refused. Eh? Shouldn't I ignore a person in trouble, moreover if it's a beautiful woman? No way! That's too bothersome, and why do I have to do that? I'm perfectly satisfied with my comfortable life now, throwing it away is just overly stupid...... ...sigh, fine, so it's go to another world, become a dungeon master, manage a dungeon and deal with the Mana circulation problem? Understood, but how to do it?

8. Maou No Hajimekata.

"I do not trust humans. They’ll betray you without fail.” Aur, the man who had obtained the ability and right to become the Maou at the end of his life of research. Summoning the succubus Lilu, he then sets out on creating his own domain, a gigantic labyrinthine dungeon… The misanthropic Maou taking on the world, the curtain rises on a dark harem fantasy!