Ukitake's Resolve

Several centuries ago, after personally witnessing the bloody battle between the expelled Soul Reaper Sounan, Tsunayashiro Tokinada, and the monk of Squad Zero—and seeing even the Seireitei's center of power razed to the ground—Aizen's view of Sounan underwent a subtle change.

Previously, he had regarded Kurokawa Sounan as the murderer of his father, an irreconcilable enemy, and had only waited to infiltrate the Seireitei and find a suitable chance to kill him.

Although the other man had grown rapidly, he also believed that his own abilities were by no means inferior.

The only obstacle was that, before his Zanpakuto had fully evolved, his spiritual pressure still had a fundamental...