Artist: https://www.pixiv.net/en/users/953306

Roshia Qinlen is the incarnation of a young man who was killed during the first-ever crossover between worlds. Originally, she was a young male, but now she is a small young girl who can return from death in a new body each time. Currently, she is a [Thief] with the ability to steal the skills of any enemy who she kills!

Artist: https://www.pixiv.net/en/users/44486721

Toy Cesta is an [A-Rank Examiner] who is the leader of the [Vanquishers], a team in the [Whitelight Guild]. She is a [Red Witch] who possesses a powerful, unknown ability that seems to distort the area around her when she uses it. She has an odd fascination with Roshia Qinlen.

The brown-haired swordsman — always seen with a red bandana tied around his head. He and Roshia Qinlen have displayed great feats as a duo, working well with one another. 

A tan-skinned mage whose hair is dusty white, glowing at the sight of her outrageous flames! Jade acts as a source of encouragement for those in her team!

Artist: https://www.pixiv.net/en/users/9269557

Anaphiel is a [Moderator] tasked with moderating Roshia Qinlen and monitoring her activities. She has assisted in keeping her [Returner] Class a secret, not allowing anyone to become aware of it to the best of her abilities.

Titled "The City of Beginnings", Fadena is the first location that our protagonist revives in! 

Located in Azeth, Fadena is the home of many Major Guilds and hides a dark secret beneath its golden roads!

The continent that was once North America and presumably a few other locations; now twisted and contorted into an entirely new location. Home to hundreds of cities, Azeth is home to many powerful Awakeners, being the assembly spot of the S-Rank Awakeners when they are called upon by the government.

A city located in Azeth, known as the most lustful city on Earth. Managed by an S-Rank Awakener, Tsukiko Tachibana, this city is known for holding hundreds of different businesses from Brothels all the way to Casinos. Divided into various districts, the most notable feature is how the city is lit up with countless colors at night.

Gates are the gateway between the human world and the 'other world' which contains monsters and vast possibilities. The appearances of gates are random and typically lead to a Dungeon, or what humanity can understand is a Dungeon.

Dungeons are graded by how dangerous they are. It is not only a matter of how strong the enemies inside of it are but also the nature of the dungeon and its components. Some dungeons are rigged with traps. Others might have a poisonous atmosphere that kills you as soon as you go in without proper preparations. 

The easiest Dungeon to enter is a [Green Dungeon]. The full extent of Dungeons isn't largely known by humanity at this time.

The rewards are pretty high and usually, they involve clearing a Dungeon or repeatedly fighting against the enemies that repeatedly spawn in them.

There are [Raid] Dungeons that can be cleared by groups, enemies do not respawn inside of them. 

There are [Nest] Dungeons, repeatedly birthing their respective inhabitants. 

The most dangerous type of dungeon is the [War] Dungeon. When a War Dungeon spawns, a worldwide notification is sent to humanity. They're rare, but apparently, mankind is given two options. Invade or be invaded.