When the Evil Madame Vadiane kidnaps Chibi-Usa the senshi rush to her rescue with the aid of Chibi-Usa's new friend Peruru. After trying to find Chibi-Usa and fight off Vadiane's henchmen to no avail the three outer senshi (Neptune Uranus and Pluto) come to their aid. To rescue Chibi-Usa before she falls into a permanent dream filled sleep Usagi must enter the Black Dream hole and save her. With some luck and a lot of effort Sailor Moon saves Chibi-Usa and she transforms to help Usagi.