The deepest part of the throat is perfect for sisters with sunken throats. The most intense deep-throat training will help these two lonely teenagers understand the world. Featuring: Karin, Nono, Hana, and Hinano Miki (HUBLK-064)

High school sisters Nonoka and Hinano live peacefully with their stepfather, Yoshio, in the countryside. However, one day, their stepfather passes away, and their care is taken by their stepbrother, Koji, who returns from the city. Initially gentle, Koji gradually turns his gaze towards the sisters, filled with lust, and begins a sinister domination. Nonoka desperately endures to protect her younger sister, while Hinano, though nearly overwhelmed by fear, clings to her older sister. However, Koji's abuse escalates, and he eventually brings a wealthy man home, forcing the sisters into prostitution. Trapped in the darkness of their home, unable to escape, the two sisters support each other, clinging to a sliver of hope to survive— Behind the sisters, holding hands before the Buddhist altar, stands the indelible shadow of Koji.