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?... more>>

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.

(Source: novelupdates) <<less

Shinichi Sakurai is a fit and grumpy-faced 3rd year college student who just wants to spend his free time alone. However, his underclassman from his... more>> high school days, the short, energetic, and very buxom 2nd year student Hana Uzaki simply will not allow that, constantly pestering him and teasing him until Shinichi is forced to hang out with her. Slowly, but surely, he gradually starts enjoying his time with her to the point that, even with all their bickering, they're almost always seen together... <<less