Lupin is invited by both Fujiko and Rebecca to a party where the collection of a recently deceased famous wine collector, Count McCalman, will be put on sale, and decides to accept both the invites trying to jump from a girl to the other during the party. In order to win Lupin's affection, the two girls challenge each other to find the legendary Nettare d'Amore (Love's Nectar), a very rare and precious wine. However, it's a really dangerous wine, connected to a dark secret.