Karl no Tensei: Transmigrated as an Assassin with a Mana Meter Novel

A teenage boy named Karl is murdered by a goddess and transported to another world with a single demand: save her from her troubles. Despite having no choice in the matter, Karl is thrust into the role of vice principal at a magical academy, where both the council and his peers doubt his abilities and experience. Armed with only a mana meter showing his limited capacity, Karl must contend with the academy's most difficult students and demanding professors while his supposed cheat skill proves far less useful than expected. Frustrated by his situation, Karl refuses to work without compensation, demanding the goddess pay off his family's debts back in his original world as payment for his service. However, beneath his resentment lies a deeper longing: the fantasy world cannot replace the warmth of his loved ones. Karl faces a critical choice between accepting the life thrust upon him or finding a way to meet the goddess and return home. Whether he will escape this destiny or become lost in a world once inhabited by gods and demons remains uncertain.