Sasami is chosen as the champion for Tsunami, the future ruler of the magical world. Tsunami gives her the power to transform into Pretty Sammy. And fight for good on Earth. All the primary Tenchi Muyo characters make appearances in the spin-off, along with new characters, including Misao, Pixy Misa, Rumiya, Ramiya, and Biff Standard (Pretty Sammy also appears in the "Mihoshi Special" and the TV series).