"I told you not to get in the way, or else..."
Eugeal is searching for those who possess the three Pure Heart crystals, using a computer program to figure them out. However, when she goes to her locker, she discovers that someone put a tack in her shoe and snails in her locker, along with a threat message that she will get into a van accident. She then overhears Mimet, one of the other Witches 5, talking with the other three witches, saying that Doctor Tomoe might replace Eugeal with her. Eugeal is sure Mimet was the one who put the snails in her locker. Afterwards, her computer finishes its search and locates two of the three people who have the Pure Heart crystals.
Eugeal calls Amara and Michelle, challenging them to a battle over the holders of the Pure Hearts and telling them to meet her at the Marine Cathedral. They decide to accept her challenge. They meet Serena at an aquarium and steal her locket so she can't interfere as Sailor Moon. After they leave, a girl named Trista tells Serena that the battle will seal their fate and she must go to help them.
Amara and Michelle, as Sailor Uranus and Sailor Neptune, arrive at the Marine Cathedral. Several tiles attack them, and one of them hits Sailor Neptune, who disappears behind a spinning wall. Sailor Uranus eventually finds her tied up. Eugeal says that Sailor Neptune is actually one of the holders of the Pure Heart crystals. Sailor Uranus runs across a bridge that only Eugeal can cross, and is shot by arrows. Eugeal reveals that Sailor Uranus also has a Pure Heart crystal. Sailor Neptune is also shot by arrows as she crosses the bridge, but this causes the arrows to run out of ammunition.
Eugeal extracts Sailor Neptune's Pure Heart, which turns into the Deep Aqua Mirror. Serena arrives and knocks Eugeal onto a chain, causing her to fall over the edge. Sailor Uranus is sure that Serena is the Sovereign who is destined to stop the Silence, and extracts her own Pure Heart with Eugeal's heart snatching gun. The Pure Heart turns into the Space Sword.
- Two of the three Pure Hearts are finally revealed.
- First unshadowed appearance of Mimet
- First appearance of Trista (in her human form)