Everyone keeps thanking Naoko for things she didn't do. Eventually she realizes the truth: There's an impostor Gauko on the loose!
Naoko and her dad both forget her mom's birthday. They come up with a plan to celebrate at the last minute, but complications arise.
Things are going missing around town. Naoko learns that the thefts are part of Bibilian's invasion plan, and she's not happy about it.
Naoko goes to a community meeting in her parents' place. But when a discussion about a new community center turns into an argument, Gauko intervenes.
When Naoko's mom spoils the ending of her favorite TV show, Naoko gets upset and runs away – to Bibilian's house! But the alien isn't a very good host.
KinPika the penguin is late to school one day. Naoko asks him about what's bothering him, and he invites her over to his very fancy house.
Bibilian orders a copy machine and decides to make clones of Naoko until one of them agrees to date him. When Naoko finds out, she gets angry!
After Naoko gets another bad grade on a math test, her father decides to take up boxing to encourage her to never give up.
When Mr. R3 suddenly explodes one day, the class launches an investigation into the incident. They quickly realize that everyone's a suspect.
Everyone is uploading videos of themselves singing to social media. Saito criticizes them at first, but soon enough he wants in on the action.
Naoko's mom suddenly doesn't remember her, and no one else in town does either! It turns out Bibilian and his family are giving out brainwashing candy.
Naoko's cousin Ichiro comes to visit, along with his snake puppet, Elizabeth. When Elizabeth says one too many mean things, he throws her in the river!
Ichiro and Elizabeth come to visit again just as Naoko and her mom are about to go shopping, so they hang out with Leonard and the Moles.
Under pressure to deliver results, Bibilian orders a world domination machine, only to learn that he has to wait two years for a missing part.
Naoko enjoys being a big sister to Leonard, but she gets jealous when his soccer ambitions lead him to start hanging out with Takashi.
To drum up business, the cat cafe offers a cooking class. Naoko, Mrs. Mole and KinPika sign up, but the proprietors aren't being totally honest.
To speed up his conquest of Earth, Bibilian runs for president. But he faces a tough opponent: KinPika's father, who bribes people to vote for him!
Naoko and her friends visit Toshio at the shop, but they get locked in the walk-in freezer. To escape, everyone tries to get Gauko to appear.
The samba competition approaches. Naoko unhappily agrees to join Toshio's samba team, whose big rival is the team led by Naoko's mother!
It's Naoko's first day at her new school, and she's running late. But once she gets there, she has a really tough time.
Naoko and her new friends stop for croquettes at the meat shop and meet Toshio, a cute employee. The alien Bibilian shows up and causes trouble.
School picture day arrives, and Naoko has a pimple under her nose! So does Kana, so they try to hide them. But Naoko also has to worry about Gauko.
After one too many food-related annoyances, Naoko turns into Gauko. But then she finds she can't change back!
Naoko's classmate Takashi Yamada keeps inviting her to play sports with him. She doesn't know why, and he's driving her crazy.
Keisuke Saito tells Naoko she shouldn't get angry all the time and gives her tips on how to stay calm. But Naoko's friends don't like the change.
One morning, Naoko is already Gauko -- and no one knows why she's angry. Hoping to turn her back, her friends take turns apologizing.
Naoko's father has been acting strangely, so she and her mother decide to spy on him after work.
After she gets good news from a fortune telling restaurant, Naoko visits Toshio's shop. But she's not the only one whose look matches the horoscope.
Keisuke Saito asks Dinosaur Police Gauko to track down miscreants around school and keep the peace. But she gets very enthusiastic about her new role.
After visiting her mole friend Leonard, Naoko starts to think that an underground lifestyle might be the answer to all of her problems.
When Gauko accidentally breaks Mr. R3, she and her friends take him to the repair shop, where they learn that Toshio's Grandpa is his creator.
Naoko tries to confess her feelings to Toshio but winds up helping out at the store instead. She's happy -- until he makes an enraging comment.
Rumors spread about a huge monster who appears on the riverbank at night. When Naoko denies it's Gauko, her classmates go out to investigate.
Mutchan always seems happy and cheerful, so Naoko decides to be just like her. But she soon realizes that people are taking advantage of her kindness.
When Babu Lisa falls into a lake on a field trip, the lake goddess lets Naoko choose whether she wants the real Babu Lisa back -- or a "good" one.
Grandpa is finally ready to test his Gauko-battling robot, Mecha Gauko! To defeat her counterpart, Gauko needs her friends' help.
Naoko's poem notebook gets turned in as homework. Despite her efforts to stop it, her latest love poem to Toshio spreads on social media.
Still determined to defeat Gauko, Grandpa decides to strike at her weak point: Toshio. Facing Robo-Toshio, Gauko isn't her usual powerful self.
The aliens are ordered home after failing to conquer the Earth. Everyone throws them a farewell party, but Naoko is happy to see Bibilian go.