Osamu Yuusei a timid, weak-minded and coward of a professor famous by the nickname “The academy's Fool” teaches in the High Heaven Academy known throughout the continent as one of the top schools that has the hardest curriculum. One day, Yuusei while visiting his fiancée and soon to be bride, he inevitably caught her kissing another man; Furious as he was, the lad called out to them and casted a spell, in response the man who his fiancée was kissing, he also casted a spell that is several times stronger than his and hits him. After the event happened, Yuusei was immediately framed of crimes he had not commited and was immediately removed from the academy. Drowned in depression, sorrow and anger after getting dismissed from the academy he travelled back to his hometown, albeit before arriving the lad was then a target of assassination sent by the his ex- fiancée's new man, on the verge of dying yuusei then awakens his latent ability that he had not known. Surviving the assassination, he fled in the forest nearby unfortunate, he stepped upon a magic trap and was sent to a dungeon. Follow the story of a unlucky professor known as “the academy's fool ” as he embarks on a journey for revenge and search for power along with his companions.