GAJK-020 A high school girl bound and trained in a warehouse. A country girl aspiring to be an idol is taught despair by her sadistic grandfather. Her body writhes with the harsh reality and rising pleasure of training, leaving Chigusa powerless.

Mona lives in a rural town with her grandfather. One day, she argues with him after he receives a call from her school about her studies. She retorts, 'I'm going to Tokyo to become an idol!' The argument escalates to the point where she threatens to run away. Her grandfather thinks, 'It seems I've spoiled her too much,' and makes up his mind. He drags Mona into the storeroom and ties her up with ropes by force. Shocked and frightened by her grandfather's sudden change, Mona listens as he begins to say, 'I'll teach you what adult fear is'…