Minasuki Toru

Toru worked as a civil servant being forced to overwork everyday due to his superior Mr. Matamizu. While on his way from from work he falls through a portal in the floor and arriving in a cave in the body of a child who recently died. After getting up and searching his surroundings he gets attacked by a monster, but is than able to kill it through pure adrenaline and strategy. After leaving the cave he leaves for town to start his new life as an adventurer in this new world.