Yozakura-san Chi no Daisakusen

It is a story of a high school boy, Taiyou Asano who lost his whole family in a car accident. After that, he was all alone and had no one behind him. He only knew his childhood friend, Mutsumi Yozakura who belongs to a high-class spy family. Her brother is pretty much possessive about her because she was their only sister and their enemies wanted to hurt her. Taiyou wanted her at anycast and for that, he went out on a journey to become the best spy in the world, and in this way, he could protect his wife from others. On his journey, he found out a lot of dark secrets about the Yozakura family.