[DeepL Translation - needs review] Volume 1 Introduction: A family disintegrates after a father's adultery. One day, junior high school student Naoto overhears his older brother Masaki being embraced by their mother. Naoto is a good boy, so you won't tell anyone, will you?" Naoto becomes an accomplice to his brother's immorality.... And after the death of his mother, Masaki asks for Naoto as if to get back what was taken from him. Naoto cannot refuse his brother's forbidden arms...? Shocking...
