Kitazawa Tatsunosuke works as an elite bodyguard for a small bodyguard protection company. He is the ace of the company, with excellent athletic abilities, and is always able to see two or three steps ahead of a situation. When he takes action, he usually manages to stay calm and collected with his judgment. His father, who was a police officer, was stabbed to death. Tatsunosuke, who is currently trying to pursue the killer, receives a request from the law firm to protect a new client. The client happens to be Kishimura Rika, a lawyer who is potentially being targeted due to a grudge against her in regard to a case she was in charge of. Because of this, she has to be under strict security 24 hours a day. Tatsunosuke, who is serious and stoic in nature, is largely inflexible and, naturally, not a good match for Rika, who hates being restricted. However, as they start to live together, their feelings toward each other begin to change.

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