Bubble: Chicano KEI - Kabukichou Kettou-hen
バブル～チカーノKEI 歌舞伎町血闘編～
This is a spinoff of the Chicano Kei series that centers on Kei's early years. It explores events from Kei's childhood, providing a glimpse into his formative experiences. The story does not introduce new characters or plotlines outside of those connected to Kei's youth.
