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.
Imanishi Uta and Kujo Misono are cousins who have been raised together since childhood. Uta is a hard worker who aims to become a freelance writer while working part-time at an izakaya, but she is stubborn and not good at expressing her emotions honestly. On the other hand, Misono is a cute and spoiled character who is loved by everyone. These two contrasting people live together in an apartment in Tokyo, are family members, and are like best friends. However, in fact, Misono has a devilish cold-hearted heart...! Uta, who lives together without knowing that Misono has a hidden side, is gradually driven to ruin. When Uta eventually realizes Misono's betrayal, she despairs and vows revenge to counterattack, but...
Kusakari Hotaru is married to Kusakari Goro, and she works as a pharmacist. She holds a secret that she is really a ninja and part of Koka Ninja’s family. Her husband holds a routine job as a postal delivery man, but he has a secret as well. He is also a ninja and part of Iga Ninja’s family. Even though Kusakari Hotaru and Kusakari Goro are a married couple, they are unaware their partner is a ninja.
The protagonist, Miharu Mochizuki (27), is a young photographer. She won a prize in a competition a few years ago, which got her noticed. However, the only job she has now is shooting flyers for a supermarket. As he struggles to come to terms with the harsh reality of his life, a chance brings him back to his hometown of Toyohashi.