Drawn by mystery, Nanamori Toki left his sick bed to visit Hokage Island, owned by his friend Izumine Masatsugu. Toki was later found dead. Now his twin siblings Kisa and Mei make their own trip to the desolate island. Their plan: to have Mei seduce the island's owner while they both look for clues about their brother's death. But a fateful encounter at the island's mansion prompts a slight change of plans... "Mourning Dinner Party" is a tale of loss, lust, and love. Join the twins as they try to uncover what happened in Toki's last moments, as well as what lies behind Masatsugu's isolated existence. What really caused Toki's death? What is this "curse"? And is Kisa falling for the man responsible?