Kyouichirou Yozakura

As the eldest son of the Yozakura family, Kyouichirou is a brilliantly skilled gold-ranked spy. He harbors an almost obsessive desire to protect his sister Mujina, concealing his brutal and formidable nature behind a gentle smile. Though he repeatedly obstructed the protagonist Taiyou in the early stages, he ultimately serves as the unwavering backbone protecting his entire family, with expertise in wielding metal wire threads known as 'Steel Spider' for both combat and espionage.