After being transported with his classmates to another world, composed and hard-working Akira Oda quickly makes a series of unsettling discoveries. When the Japanese students are blessed with magical powers, Akira notices that although he has received the assassin class, Tsukasa Satou—who was given the strongest hero class—is no match for him. Doubting the words of King Edmond Rose Retice, who urges the new heroes to slay the demon king, Akira decides to conceal his powers and discover the truth of this world. While his classmates fall one after another under the hypnosis of Queen Maria Rose Retice, Akira allies with the Retice Knight Commander Saran Mithray to hone his skills. Alas, in a shocking turn of events, Akira is framed for the murder of a high-profile individual of the castle and forced into exile. After hiding in a dungeon where he can level up unnoticed, Akira sets out on a journey to become strong enough to thwart the evil plans of King Retice and ultimately return to his world—where the survival of his loving family rests upon his shoulders. [Written by MAL Rewrite]