Arc 4Kūkaku’s Escape and Return
Shiraishi rescued Kūkaku Shiba from prison and helped her face Munemasa Tsunayashiro, while the Shinigami dealt with the escaped prisoners and the threat to Ganju. After Kūkaku escaped again and reunited with Shiraishi, she told him she loved him but planned to leave to pursue her dream.
- Sajin Komamura killed Minamoto no Yoshitsune on his way to the Shin'ō District, while Shiraishi freed Kūkaku Shiba and defeated Okita Sōji before escaping with her.
- Mayuri left Nemu Kurotsuchi in the Fourth Division’s care, and Oda Nobunaga used his Bankai to free six prisoners in Muken before dying as Yamamoto sealed the passage.
- Shiraishi and Kūkaku met Sōya Azashiro, who helped them escape through Hakutōmon, while Yamamoto briefed the captains on the escaped prisoners and the danger to Ganju Shiba.
- Retsu Unohana sent Nemu to warn Shiraishi and Kūkaku, and they returned to the Shiba Clan headquarters to protect Ganju from Munemasa Tsunayashiro.
- Munemasa attacked Kūkaku and Shiraishi, using Fox Nightmare to control other Zanpakuto, and Shiraishi sent Kūkaku to safety as blades overwhelmed him.
- Kūkaku fired the Kūkaku Cannon to break Munemasa’s barrier, but he captured her, and Shiraishi, Byakuya Kuchiki, and Kenpachi Zaraki fought Munemasa until Shiraishi stabbed him through the heart.
- Sōya Azashiro freed Kūkaku from Seireitei, and she reunited with Ganju and the retainers before leaving to find Shiraishi in his cave.
- Kūkaku reunited with Shiraishi and told him she loved him, but she planned to leave because she would not give up her fireworks-making dream.