Elven girl, "Aria" is an adventurer. A small beast with an adorable face embraces Aria's fruitful chest, she decides to keep it as a pet... more>> and names it "Tama". At first sight it's just an average cat, but Aria has yet to notice that Tama is a former Knight and that his identity is not a cat, but a young monster of the strongest class "Behemoth". <<less

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

In another world, the Hero and the Demon King continued to oppose each other. As their great magic collided, the explosion crossed over worlds and destroyed a classroom full of high school students. The victims who died in that explosion will be reincarnated in that alternate world. Our heroine, who has the lowest standing in the class, was reincarnated into a spider. She nevertheless faces this challenge head-on with great determination, and adapts to it surprisingly quickly.... more>>

This is the story of how our protagonist, who was reborn as a weak spider monster, does whatever needed to survive. <<less

Lin Yuan, who died in a car accident, accidentally traveled to a parallel world and became a monster with a sign-in system! Check in at... more>> the Mariana Trench and reward “devouring power”! Sign in at extreme abyss Island and reward “Explosive Breath”! Sign in in the Arctic Icefield and reward “Red Lotus Form”! Check-in in the Amazon Rainforest and reward “God of Destruction Form”! However, Lin Yuan, with the idea of not being born without invincibility, signed in silently on extreme abyss Island for thirty years… Thirty years later, an alien ship came to attack the earth? The Dark Titan had collected all six World Destruction Gems? Alien monsters invaded? Was the dark universe trying to destroy human civilization? Lin Yuan: "I'II just ask, who can handle my ultimate red Iotus bursting breath!" <<less