prologue

Kazanari Katsuragi is the son of kazanari family and the brother of Tsubasa Kazanari the popular pod idol as a kid is always in the shadow of his older sister their parents always gives all their love and intension to Tsubasa as for katsuragi is left behind his for this factors that katsuragi relationship with his sister Tsubasa are not that good he finds his talent is in science and in age 14 he manage to develope the build driver, Nabula gas, and fullbottle along with his bestfriend Banjou Tetsuya left home to start a new home as kamen rider build but can he fix his relationship with his sister.