Kaname Tosen was, in truth, quite a pitiful person.
Back then, he and Koka had sat beneath the star-filled night sky, talking freely about life. They had been close friends who could tell each other anything.
Beautiful and kind-hearted, Koka had once told Kaname Tosen of her dream. She wanted to become someone who parted the clouds, allowing those faint rays of light to keep shining.
At the time, Kaname Tosen had also resolved to become a Shinigami, fight Hollows, and bring peace to the world. He had been completely unaware of the world's darkness.
After that, Koka married Tokinada Tsunayashiro.
Over a trivial dispute, that despicable man killed his colleague and his own wife. He even escaped judgment from Central 46 because of his status as a member of a Great Noble Clan.
When Kaname Tosen saw Koka again, she had already become a cold corpse.
Both of them had been Shinigami with an overwhelming sense of justice, wholeheartedly hoping for a peaceful world filled with beauty.
Tokinada Tsunayashiro, on the other hand, was the very embodiment of despicability. He had destroyed all of that through his own actions. His crimes were unforgivable, and his death was well deserved.
As for Su Feng's earlier actions, they had merely been intended to make things difficult for Aizen.
Kaname Tosen had joined Aizen's ranks in the first place for revenge, to carry out justice in his own way.
Now that Tokinada Tsunayashiro was dead, he would inevitably begin to question whether what he had done was truly just.
After all.
Using the souls of Rukongai and the Shinigami of the Gotei 13 for Hollowfication experiments was, no matter how one looked at it, the act of a pure villain.
The only thing missing was the word "evil" written across his face.