Alphapolis (Original Publisher)

This old man is too strong, LOL In a world where dungeons had suddenly appeared on Earth, a dungeon in Shinjuku, Kabukicho was said to be the most difficult dungeon in the country. Then, an unknown individual managed to conquer that dungeon. But the identity of the conqueror of the most difficult dungeon in Japan…

A boy who died after a steel pillar struck his head is granted reincarnation into another world by a god. Reborn as Lagas, the fourth son of a noble family, he discovers he has no aptitude for elemental magic—a rare situation for a noble-born child. This often led to others looking at him with pity.…

“Vomiting Blood After a Broken Engagement!? The Villainess Was Poisoned!? When her fiancé announces their engagement is over with a flippant, “Sorry, Katrina, but I’ve found my true love,” Katrina is left stunned. Not only is the reason for their split obvious infidelity, but she’s forced to endure the smug expressions of her ex-fiancé and…

The story is about a protagonist who is unexpectedly sent to another world alone with the mother of his childhood friend. While searching for a way to return home, he deepens his bond with her and the people of the other world.