A high school student who discovers that his childhood friend, Mutsumi Yozakura, comes from a family of secret agents. When Mutsumi's family is targeted by dangerous enemies, Taiyo finds himself drawn into a world of espionage and intrigue. To protect Mutsumi and support her family, he must learn to harness his own latent abilities and navigate thrilling missions filled with action and humor. The series blends elements of romance, comedy, and adventure, highlighting themes of friendship and loyalty.