Following the sudden loss of their parents, Yukari and her younger sister Miku inherit a crushing debt to a powerful syndicate and must choose between servitude or death. They select the former and are placed under the guidance of trainer Shunji Iwashiro, who begins their introduction to strict discipline and obedience. As the sisters confront the first steps of their altered lives, they face public scrutiny, physical demands, and lessons designed to ready them for any client expectation. Their shared bond becomes both comfort and challenge amid the unfolding regimen.