Kagami Junichirou is known as a genius physicist. He wrote a thesis at a young age of 17, and it was even published by "Nature," a prominent science journal. After college, he devoted himself to being an otaku and a NEET: Updating his anime blog and aiming for #1 ranking. He claims to have a disease that makes him do ONLY what he wants to do. Desperate to get him to do something with his life, his little sister manages to get him a job as a teacher at his alma mater.