Although he is unable to stop Rukia's departure to the Soul Society, Ichigo resolves to rescue her with the aid of Ury and several of his other spiritually aware classmates Orihime Inoue and Yasutora (Chad) Sado. Prior to reaching the Soul Society, Ichigo meets ex-Soul Reapers Yoruichi Shihin and Kisuke Urahara, with the latter enabling Ichigo to become a full Soul Reaper. As Ichigo and his friends faced them, dissension occurs among the Soul Reaper captains over both the incident as well as Rukia's sentence and the death of a high-ranking Soul Reaper captain named Ssuke Aizen. But in reality, having faked his death, the events were all staged by Aizen to obtain an item called the Hgyoku from Rukia. Once having the Hgyoku, Aizen and his conspirators leave for Hueco Mundo, the Hollow World, to enact his scheme by recruiting humanized Hollows called Arrancars to serve him.

From there, the Soul Society recognizes Ichigo and his friends as allies when they find themselves attacked by Aizen's elite Arrancar servants, the Espadas. By then, Aizen's scheme is revealed to create the Oken and use it to reach the Soul King and kill him.


At this point, Ichigo learns his transformation into a Soul Reaper also created an inner Hollow that attempts to take over his body. With that knowledge, Ichigo receives the means to control his Hollow powers with the aid of the Visards, Soul Reapers who were nearly turned into Hollows by Aizen. When Aizen kidnaps Orihime, Ichigo and his friends pursue. However, through he lost a majority of his Espadas, Aizen reveals Orihime's abuction was a lure to cripple resistance from stopping him from turning the souls of Karakura's Town residents into an Oken.


Though the strongest of his forces are defeated, Aizen reveals he absorbed the Hgyoku and uses its power to transform and defeat the Soul Reaper captains. As Aizen enters Karakura Town after revealing that his tribulations were his doing, Ichigo undergoes intense training with his father Isshin, revealed to be former Soul Reaper, and becomes an equal to Aizen. Eventually, the battle ends with Aizen defeated and imprisoned after being weakened by Ichigo's final attack. But the attack has a side effect with Ichigo eventually becoming a normal human. However, seventeen months later, Ichigo regains his Soul Reaper powers after encountering Xcution, a group of humans possessing "Fullbring" powers like Sado who serve a former Substitute Soul Reaper named Kgo Ginj. Helping the Soul Society defeat Xcution, Ichigo then regains his title as the Substitute Soul Reaper.


Following these events, a group of Quincies called the Wandenreich declares war on the Soul Society. Ichigo once again ventures to Hueco Mundo, which has also been invaded by the Wandenreich; at the same time, the captains in the Soul Society battle the Wandenreich's elite "Sternritter" generals. During the invasion, several Soul Reapers are killed; with Head Captain Yamamoto killed off by the Wandenreich's leader Yhwach, an ancient Quincy revived in the present. During the aftermath of the invasion, the Royal Guard arrive to take Ichigo and several of his comrades to the Spirit Palace where they begin recuperation and training for the next fight against the Wandenreich. During the Soul Society's recovery, Ichigo learns about his heritage from his father and that his mother was a Quincy whose death was caused by Yhwach's revival. Meanwhile, Yhwach recruits Ishida to be his successor and prepares for the final war.

