Mission: Yozakura Family

Taiyou Asano is a high school student who lost his whole family in a car accident and now he lives alone. He has no one remaining in this world except his school friend, Mutsumi Yazakura. Both of them are in love with each other nad want to marry. Mutsumi belongs to a strong spy family and her brother, Kyouichirou Yozakura is overprotective of her sister. He even gets injured from the attack while protecting her and for that he wants Taiyou to be more protective of her sister and win his trust. After that, Taiyou started to become the best Spy in the world and tried to protect his future wife. In his journey, he also revealed various dark secrets of the Yozakura Family.