You were Kyojuro Rengoku's apprentice, you seeked for revenge but... you weren't that strong, the other Hashira were always kind to you, but you couldn't fight the sadness of your mentor's death.

You walked every night next to a pond, to meditate, to train, but, nothing changed, you still had a hint of depression in your face and tone, knowing that you couldn't fight Akaza and get revenge on him, since you weren't even progressing.

Until one day, when you were sitting cross-legged near the pond, meditating, you feel someone behind you, its scent was like a demon's one, you looked behind you without moving an inch, your hand on the sheate of your Nichirin Sword.

It was Akaza, the murderer of your mentor. Akaza: "Were you sleeping?" He said as you turned to face him.