Papa to Haitoku Kiss - Mama ni wa Himitsu no Koi

"I've always thought of papa only, so tonight just ... love me, not mom."

Rumi lost her father when she was young. One day at the age of 12, she saw her mother make love to her stepfather, Souji. Thus, Rumi realized that her feeling for Souji was other than that of parent-and-child. While having a sense of guilt about her mother who always took care of her, Rumi finally approached Souji on her 22nd birthday night when her mother was away for work.

Despite a betrayal to her beloved family, still, it was her desire and forbidden love that never stopped.