Kenkou

In a certain other world. Alfe, the daughter of a Duke from the Latria Duchy, is forced to flee her homeland when it is invaded by a neighboring country. She escapes to the nearby town of Verdan. Having lost both her wealth and family, and with her stomach empty, she decides to become an adventurer in order to survive. However, during her first job, she encounters goblins and barely escapes with her life. Seeking a way to fight as an adventurer, Alfe wanders the town. As she looks around, she notices an unusual dojo and a suspicious man in a martial arts uniform standing there.

After a tear in reality pulls Kagari Shuya into a white room he discovers a futuristic interface for reincarnating in a different world. After looking through the different races and skills he unlocks a new race, Lucivault, a type of vampire with none of its characteristic weaknesses. All set to start his life in a new world, Shuya is confused to discover that he is enveloped in darkness. As it turns out something went wrong when he was transported and instead of appearing where he was supposed to, he appeared in an underground cave. Shuya faces untold dangers, runs for his life, before finding his way out of the underground world. After escaping he meets his Shishou and begins to learn to fight with a spear. There is also a cute black cat named Rollo.