The Sovereign of Silence, a mysterious dark figure (who had a cameo appearance in the previous episode), commands Doctor Tomoe to find Pure Hearts for her to eat. So, he devises a new plan to steal Pure Hearts for her. Mimet finds a new target for heart snatching, a movie star named Joshua Ita (whose photo she is staring at, and appears to be distracted by). Tomoe puts a gun in his Heart Snatcher oven to create a new Daimon, which Mimet carries with her in a briefcase.
Trista's explanation of the Purity Chalice makes Raye realize that her vision is of the Silence destroying the earth because the Sovereign of Silence has the Purity Chalice. Trista came from the future to prevent this from happening. Rini asks Serena to take her to the park, and Mina offers to take her because Joshua Ita is starring in a movie that is being filmed there. Mimet offers him some cakes, but three women knock her down and crush them.
During filming, Rini's hat is blown away, and a girl named Hotaru gets it for her. During a break from filming, Mimet, who is in love with Joshua (yet still wants to kill him) discovers that he and his co-star are actually in love, and so she releases the Daimon, Western, who chases after him. The girls all transform, and Sailor Moon uses Moon Spiral Heart Attack on Western, but she counters the attack easily. She then sucks out Joshua's Pure Heart through his mouth and eats it.
Western spots and captures Rini with a lassoo in an attempt to blackmail the scouts, but Sailor Pluto attacks her with Pluto Deadly Scream, and Sailor Moon says "Moon Crisis Power" with the Purity Chalice to transform into Super Sailor Moon. She uses an upgraded Moon Spiral Heart Attack, called Rainbow Moon Heart Ache, to destroy Western, releasing the Pure Heart unharmed, which is returned to Joshua.
Mimet runs off. Rini's leg was scratched by Western, and Hotaru heals the scratch. Sailor Uranus and Sailor Neptune still refuse to work with the Sailor Scouts. Rini goes with Hotaru as she returns home. She meets Hotaru's father. After Rini leaves, and Hotaru is in bed, her father enters his secret lab, as he is Doctor Tomoe.
- First and last appearance of Daimon Western
- First unshadowed appearance of Doctor Tomoe