Mission: Yozakura Family

Taiyou Asano's life changes after his family's car crash, leaving him socially isolated. His only reliable interaction is with childhood friend Mutsumi Yozakura, who happens to be the head of the world's most skilled family of spies. Mutsumi's brother Kyouichirou is fiercely protective of her, viewing Taiyou as a threat due to his feelings for her. To stay alive, Taiyou must marry Mutsumi and integrate into the Yozakura family, which sets him on a path to learn espionage skills to safeguard his new wife and unravel the dark history surrounding the Yozakura family.