Tōichirō Aoi functioned as the former right-hand man of the Sakuragi yakuza family, working closely with Toru Kirishima and often intervening to curb Kirishima’s troublesome tendencies. He met his wife Sanae during this period, and they welcomed their first child, Kōki. When Sanae became pregnant with their second child, Hina, her anxiety heightened due to Aoi’s perilous lifestyle and frequent absences. This culminated in a severe panic attack after Aoi returned injured from a mission, compelling him to acknowledge the strain his yakuza ties inflicted on his family. He chose to leave the Sakuragi organization to safeguard his wife and children, thanking family head Kazuhiko Sakuragi for respecting his decision. Aoi displays a typically relaxed demeanor but flares into intense anger during clashes with Kirishima or when confronting his son Kōki’s flirtations with Yaeka Sakuragi. He reveals emotional vulnerability, shedding tears during pivotal moments—like when Yaeka assured him Kazuhiko bore no resentment over his departure, or when reuniting with Kazuhiko years later. He occasionally employs lighthearted blackmail, leveraging embarrassing stories or photos of Kirishima to coax compliance with Yaeka’s requests. Physically, Aoi stands tall and lean, sporting burnt orange hair swept right with a dark undercut and narrow blue eyes. In his Sakuragi days, he wore formal suits and yellowish-orange tinted sunglasses; after leaving, he adopted casual leather jackets, earrings, and jeans. He maintained a mentorship over Kirishima, once physically disciplining him for recklessness. Their dynamic featured significant friction yet evolved into mutual respect, with Kanami Kurosaki observing Kirishima unconsciously mirroring aspects of Aoi’s demeanor. Years after departing the yakuza, Aoi encountered Kirishima and Yaeka at a hospital, expressing pride in Kirishima’s growth and apologizing for his abrupt exit. He later visited the Sakuragi residence to reconcile with Kazuhiko, bringing a gift from Sanae and discussing his tranquil family life. His hobbies include driving and dismantling or remodeling objects.