A comet has landed in Japan, where Tsunami and her family are on vacation. Ramia has gone missing and become an amnesiac. Washu analyses a sentient blob of cosmic slime that was found at the comet crash site. Misao is attacked by a sorcerer, who overwhelms Pretty Sammy the next day. Makoto and the sorcerer are revealed to be transformed cosmic slimes. With Ryo-Ohki and Pixy's help, Pretty Sammy defeats the sorcerer, who restores Ramia's memories.