Naota's older brother went to the U.S. to play baseball, and his brother's girlfriend is making advances on him. There's a so-called alien girl hitting on him, too. With a guitar. Did we mention the robots keep springing from Naota's head?
Hanging out by the river, no one would suspect Mamimi is a girl with a dark past. She's been obsessed with a videogame. There's been a string of fires around town. If that's not enough, there's something growing inside Naota's head.
With a robot and an alien at home, Naota tries to at least have a normal school life. The class is putting on a play, and Naota is playing a cat. He's sprouted cat ears from his head. Class president Ninamori's been chosen to play the lead.
Though he's carried around his brother's bat, Naota has never hit anything. Now his brother's gone, it's Naota's turn to prove his worth. The baseball team doesn't seem to be doing so well. What is Haruko doing playing for the other team?
Mabase is safe for now, but there's a new kind of danger. Naota finds himself in the midst of a survival game, with Haruko on his team. With weapons blazing, it looks like Kitsurubami has joined the fray. Amarao is getting his hair dyed?
The end is near with both Haruko and Canti at large. Medical Mechanica is preparing to move. Before Amarao can do anything to stop it, he needs to find the terminal core. Mamimi has found new friends with an appetite for the mechanical.
Hidomi's Dream - white ash covers the entire ruins, behind which a row of humongous irons comes thundering after Hidomi who is now a zombie.
Hidomi wakes up from yet another dream of her becoming a Zombie. At school, Raharu gives her a handout to bring over to Ide, who didn't show up to class.
Crazy things happen during Hidomi's NO activation, and she is now left with a cheerful and happy personality, which is the total opposite of her real self. The only way to bring her back to normal is to destroy the cables of the giant iron.
Marco is the only one that seems to think that happy Hidomi is attractive. While he's aware that Ide is in love with her, he works part time to buy her a charm. Meanwhile, Jinyu and Raharu scheme to go up to the plant in her Bel Aire.
Having made damage to the plant, the iron now stands up straight. Raharu tells the class that she's happily married and now pregnant. The only way to become happy is to go to the amusement park (run by Tonkichi).
Trying to get Ide back, Hidomi attacks Raharu physically first then verbally. She tells Raharu that she is acting immature because she knows that she is using Hidomi because Raharu is in love with Atomsk.
Kana Koumoto - a cheerful 17 year old who can often be a klutz and nosey. One day, while hanging out with her besties (Pets, Mossan and Hijiri), Mossan starts making a rocket using empty soda bottles.
One morning, Kana and her besties witness Hijiri kissing a college student Toshio inside his car. Acting more mature than any of her classmates, Hijiri suggests Kana and her besties to do a photo shoot with Toshio.
Mossan is the most mature of all 4. With a passion of becoming a designer, she has been working outside of school. Upon discovering her working towards a fashion contest, Kana feels the urge to help her, which rubs her the wrong way.
The 4 girls come watch the basketball game that their Sasaki is a member of. Kana has been secretly in love with Sasaki, whom Haruko ends up making out with. This triggers Kana's NO to activate, but she notices that and runs away.
One hot summer day, the 4 girls and Haruko are playing in the pool. They notice that Pets is missing. Kana later hears from her classmate Aida that Pet's family is very rich and they are moving to Mars.
Depressed, Kana flips over the collection of photos she took with her besties. The next day, the 3 girls gather by the beach as they watch the rocket Pets is supposed to be on.