Tsugumi feels conflicted. She witnesses her beloved older sister willingly engaging with their despised father in a way that arouses him. This shocking sight causes Tsugumi’s heart to tremble. She can’t accept that her mother is married to a bastard like him, let alone that her sister is involved with him too.
Consumed by extreme anger, Tsugumi decided to confronts her detested father. But her father ignored all of her words and forcefully dominates Tsugumi once again. And insisted that his actions are solely meant for disciplinary purposes.