Usagi goes home, and Ikuko says that ChibiUsa went to spend the night at a friends house. Luna goes to Mamoru's place and leads him to ChibiUsa, who is sitting with her ball all alone on the street. Mamoru takes her to his apartment and puts her to bed. ChibiUsa has a dream that she is calling out to her parents and being told that Sailor Moon is invincible. She wakes up and begins crying for her mother. Mamoru cheers her up with Luna and a Tuxedo Kamen doll. ChibiUsa perks up and shows them her ball- the Luna P ball. She bounces it, and it says, "Small Lady! Small Lady!" ChibiUsa explains that Small Lady is a nickname from her mother. When Mamoru touches Luna P, he feels like he is surrounded by something (it was long hair). Mamoru asks about ChibiUsa's pendants, and she says she can't go home without them. He asks where her home is, and she says it is far away, close by. ChibiUsa asks if Sailor Moon is powerful, and Mamoru says she is invincible. Chibiusa wonders if Sailor Moon can help her mother, and goes back to sleep.
The next day, Mamoru brings ChibiUsa and Luna home. Usagi and Mamoru discuss the pendants on ChibiUsa's neck and Mamoru tells her that ChibiUsa mentioned saving her mother. Later on at the arcade, Motoki is in shock that he knows who the senshi really are, and where their control room is. Ami is playing chess, and Makoto and Ami decide to investigate Rei's school for clues. At the school, Kotono tells the girls that Rei told her not to tell anyone about the sisters with the black crescents on their foreheads and the body that spontaneously combusted. The strange sisters and the fortune teller from the Black Moon club have vanished. Asanuma remembers the UFO they spotted and all the recent UFO sightings. Asanuma says it seems like an abduction. Minako, Usagi, and Mamoru join Makoto and Ami, and Asanuma tells Kotono that Rei was different just like them, like they have a secret.
Asanuma remembers when he first met Mamoru, he was coming to take the entrance exam for Azabu Junior High. Mamoru told him he would get in as they shook hands, and it was almost like Mamoru had shared his power with him. He was accepted to the school months later. While playing soccer, a student kicked Mamoru's arm, causing it to bleed. Asanuma saw Mamoru by himself, healing his own cut with his own touch.
Meanwhile on Nemesis, Sapphire is constructing more droids to end to Earth. Rubeus locks Sailor Mars away, and Berthier prepares to attack.
At school, Ami practices chess when a pipe bursts and sinks malfunction. Ami senses where the pipe is broken, and shows the janitor where it is. A strange woman appears and says that dowsing without a pendulum like Ami did is evil. Later, Ami goes swimming at the sports club. Usagi and Naru meet her there, and Ami says that her divorced father, a watercolor painter, is a member of the sports club. He taught Ami how to swim and play chess. The girls look at the spa television, and Berthier appears in an interview about her dowsing skills. Berthier claims to use her dowsing powers to find missing people. Berthier is also a chess champion, and she challenges Ami on TV.
Ami goes to the tv studio, and Berthier knows that Ami is Sailor Mercury. Ami hits the power switch to turn the studio lights off and morphs. Usagi and Makoto step in and morph. Jupiter yells, "Sparkling Wide Pressure!" and attacks but Berthier fades away and runs through a crowd of people in the city. The people on the street, however, are droids in disguise. The droids attack Mercury, but Venus joins them and uses the Whip of Love to destroy the droids. Mercury yells, "Shine Snow Illusion!" and attacks Berthier but Berthier blows open a sewer and traps Mercury in a globe of water. Moon uses Moon Princess Halation to kill Berthier, but Mercury is stilled trapped and she can't breathe. Venus tries to save Mercury with Rolling Heart Vibration, but it doesn't work. Rubeus appears again, and Luna and Tuxedo Kamen join the commotion. But it is too late- Mercury has been abducted.