Hajime Katsura

桂 はじめ

Katsura Hajime is Rei's younger brother who is said to have been kidnapped by Leviathan. [Spoiler] It is later revealed that he was transformed into Sleepmon by Biomon. Biomon was ordered by Leviathan to do so after Hajime betrayed him and released Rebootmon. [/Spoiler]