Junichirou Kagami, a former prodigious physics scholar, transitions from academic brilliance to a hermit lifestyle centered around personal indulgence. Embracing a philosophy of doing only what he desires, Kagami immerses himself in anime, manga, and blogging after abandoning his scientific pursuits post-graduation. His sister, Suzune, disapproves of his aimless existence and covertly secures him a temporary teaching role at their old high school, coincidentally due to the regular physics teacher's maternity leave. Despite his reputation as a brilliant young mind, Kagami faces the challenge of imparting valuable knowledge to a group of students as a dedicated otaku. Will his unconventional approach resonate with the class, or is the clash of worlds too great to overcome?