Chapter 0
Meet the top delinquent from Mars! His name is Ukita Kikuchiyo and he's now trying to take over new turf on Earth after switching schools but due to living in Mars’ low gravity, he quickly finds out he's quite weak. Luckily for him however, after getting beat by a gang, he meets up with Shirokuma Fuuta, a practitioner of Aikido who teaches him the ways provided it’s only for self defense.
Chapter 23.5
Returning from school, third-grader Ryunosuke is introduced to a young girl. His father tells him that she will be his little sister starting that day. Her name is Koharu. She is blind and her arms and legs are prosthetics. She holds within her a power beyond human understanding... A bizarre and fantastic Saiyuki story for a new generation!