Saiaku Musou no Madou Tankyuusha - Maryoku Zero Kara Eichi to Gonju de Taizai no Eiyuu e summary: Despite having zero mana and physical strength, Eric sets out on a perilous journey to find a way to break an ancient curse placed on his sister. However, through his quest, he acquires ancient wisdom and forbidden spells, which eventually shakes the world with various monikers such as "Dragon Slayer," "Ruin Plunderer," and "Mad Researcher"... This is a magical fantasy world where he wields wisdom and forbidden spells in search of a single answer!