Arc 13The Spearhead Assault
Masaki Kurosaki and Shiraishi became entangled in the Fullbringers’ conflict, and Shiraishi killed Kūgo Ginjō to keep him from Aizen. The Soul Reapers launched a surprise assault on Aizen’s Royal Palace, but Aizen survived and escaped to Seireitei while Shiraishi and Yamamoto were stranded in Hueco Mundo.
- Masaki Kurosaki and Isshin Shiba met Shiraishi at Tokyo Tower, where Masaki explained her plan to draw out Shūkurō Tsukishima.
- Shūkurō Tsukishima manipulated government officials into locating the research institute, where Masaki defeated Jackie Tristan and Kūgo Ginjō arrived with the Fullbringers.
- Ulquiorra killed Kūgo Ginjō and several Fullbringers at the institute, but Shiraishi saved Riruka and brought her to Soul Society.
- Shiraishi accepted a mission to kill Kūgo Ginjō, entered Hueco Mundo, and killed him in Las Noches before Aizen stabbed him and Shiraishi escaped with the corpse.
- Shiraishi returned to Soul Society and warned Kisuke Urahara that Aizen had fused with his Zanpakuto, while Yamamoto prepared the captains for a surprise attack.
- Shiraishi and Yamamoto entered the Royal Palace through a Garganta, where Shiraishi’s Gun Storm overwhelmed Tsukishima, Loly, Szayelaporro, and the other enemies.
- Yamamoto and Shiraishi fought Aizen, who survived their attacks and revealed that their battle had helped him fuse and temper his powers.
- Aizen escaped to Seireitei after sealing Hueco Mundo against Garganta travel, leaving Shiraishi and Yamamoto stranded as he reached the ruined Research and Development Institute and met Aura Michibane.