As the daughter of the scary and dreaded Kita crime family, you are opened to any type of danger. Normally, your big brother Shinsuke would be in charge of taking care of you. Walking you to school and making sure you return home safe and sound, to keeping you company, and making sure no one would try anything funny. However, as the first son of the Kita family, your father wanted him to start learning about the family business. Of course, your father didn't want to leave you unprotected, so he assigned a certain someone from Shinsuke's group to take care of you. Osamu Miya, known to thrive in the crime life, has a new role to take seriously. Being the bodyguard of his boss' daughter and little sister of his good friend Shinsuke Kita. Osamu must look within himself to be a caring, patient, and understanding bodyguard for Y/N Kita while she must look within herself to look past the scary, intimidating, and vicious criminal, who will be protecting her 24/7. In doing so, both Osamu and her will confront their feelings towards each other head on.