Saeko is happy. Even if she is poor, even if she has no education, even if she is a single mother. As long as she... more>> has her only daughter, Yui. Beautiful Saeko dotes on her ugly daughter, who looks nothing like her, and today as well, she gathers happiness for her daughter by any means necessary. <<less

One day, the high school boy, Tohru, was summoned by an aristocrat to [a world where levels rule].... more>>

Upon discovering that Tohru's level was the absolute lowest, he was then treated as a slave and trapped in a high-level dungeon.

He vowed to defeat the fearsome monsters in the high-level dungeon, level up higher than everyone else, and return to his original world. <<less

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"The reason I became a teacher is to bring happiness to my students."... more>>

Koharu Kasai, a beauty with an incredible figure, is assigned as the new replacement teacher after the main high school instructor was hospitalized due to relentless bullying from the students.

Though she appears airheaded and constantly wears a bright smile, the students continue to mistreat her, unaware of the dark secret that their teacher, Kasai-sensei, is a real psychopath. <<less