Maria Mochizuki was raised in a strict family of musicians, enduring her father's harsh, militaristic clarinet training since childhood. This instruction went far beyond mere music lessons, bordering on sexualized training. Under the guise of education, her father repeatedly subjected her to sexual harassment—forcing her to clamp the clarinet between her breasts, making her brother simulate his penis as the instrument for her to suck. Despite this, Maria clung to her dream of becoming a top-tier musician, and once again, another grueling training session begins between the siblings.