Rei Kagami (Ryosuke Yamada) is a billionaire and the CEO of the leading conglomerate company Kagami Group. He is an extremely smart inventor, who has developed revolutionary products, and is now doing research on high precision AI. When he was little, he was a curious and kind kid. As he grew up, his curiosity remained, but he became self-centered. For certain reasons, he begins to teach at a school, while hiding his identity as a billionaire and the CEO of Kagami Group. His performance as a teacher is quite poor compared to his excellent work as a CEO. He is incapable of understanding the ordinary lives of the teachers and students around him.

Onodera Yumeko may look smart on the outside, but at home, she is a complete mess in terms of housework and fashion. Yumeko is particularly clumsy in romance and always dream about her first love in high school who she still thinks is her ideal man. Somehow, Yumeko keeps experiencing trouble one after another. Her boyfriend whom she thought would propose to her ended up breaking up with her, and her junior colleague at work betrayed her. Yumeko becomes heartbroken but she suddenly meets a young man who is the spitting image of her first love and her daily life changes like a roller coaster.

An aspiring announcer turned part-time instructor falls for her sweet student “Yukari-kun”—until she learns he’s actually an older detective. Romance, scandal, and cases collide.

As a member of her high school's newspaper club, Airi looks forward to the annual creation of the town's tourism promotion posters, but it gets canceled; to suggest an alternative project, she rallies her class for support.

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