IESP-676 Monami Rin Lesbian ban lifted I fell in love with my sister

It's about the older sister Suzu and younger sister who were separated when their parents divorced when they were young. - A few years later, her father passed away, so she had to live with Kotone again. - One day, when Suzu is doing her daily routine of masturbation, Kotone witnesses her at the scene. - Kotone is happy that her sister also likes masturbation, and when their lips touch each other, they are invited into the forbidden world of lesbianism...