Melty has succeeded in defeating her older sister and has purified her mind. Upon returning to her country she noticed that everyone besides her was enjoying crazy sexual escapades and after some convincing decides to join in, her sister included.
Melty’s Quest 1

After triumphing over her sister and cleansing her spirit, Melty returns home only to find the kingdom throbbing with uninhibited passion. Drawn into the feverish desire around her, she surrenders to the intoxicating pleasures she once resisted. With playful persuasion, even her sister joins her—both entwined in the heat of newfound ecstasy, their bodies melding in unrestrained delight as they indulge in the blissful indulgence overwhelming the land.