A secret international project called 'Project: Ameliorate' combined children of different backgrounds and identities with no memories of their past lives, into one organized facility. Years later, all of those children have grown up. It is the year of the advancement, an important year for all of those to participate in tournament against other contestants. Oston, 65%, is one of them. During his journey of leveling up in percentage, he met another peer named Kaizen-who might just be the breaking point to finding his identity and past...and the hidden secrets of this 'so-called' project.