In a peculiar turn of events, class 3-E at Kunugigaoka Magic School is assigned a unique task: eliminate their homeroom teacher, the enigmatic Demon King Koro-sensei. Seeking assistance from the formidable trio of Karma Akabane, Itona Horibe, and Ritsu, the class embarks on this daunting mission. However, their journey to vanquish the target proves to be a daunting ordeal, especially when rival factions emerge with similar intentions. Enter the whimsical realm of Koro-sensei Quest!, where Nagisa Shiota and the magical students of class 3-E, transformed into chibi versions, navigate a blend of training and humor under the tutelage of their very adversary. Amidst the chaos, the group faces a series of amusing yet challenging predicaments as they strive towards the ultimate goal of toppling the Demon King.