A female student, bound and disciplined in a warehouse, is staying at her grandfather's house near the swimming competition venue. Under the guise of celebrating her birthday, she falls into rope discipline... (GAJK-033)

Wuba is participating in the prefectural swimming competition. Since the venue is near her grandfather's house, she's allowed to stay overnight during the competition. Her grandfather, whom she hasn't seen in a long time, is very kind and even prepared a cake for her because it's Wuba's birthday the day before the competition. That night, Wuba falls asleep suddenly due to drowsiness. When she wakes up, she finds herself tied up in a warehouse. Before her, looking confused, is her grandfather with a strange smile…