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Nijika Kohinata is a tall cheerful young girl who dreams of one day being an actress like her mother.
The story is set at the elite Omega High School, where test results decide everything. The high-scorers in the student council, in particular the student council president, have a lot of authority. Yuria Aikawa comes to this school, and though she seems like an ordinary girl who loves fun things and her boyfriend Shuri, she's actually a super-genius who gets the top score on every test. She becomes student council president and tries to make school life more fun in various ways.
After the death of Saizou, Kabamaru's horribly strict grandfather and Iga ninja teacher, an old lady named Ran Akoko claims that she received a letter from him asking her to take care of his grandson. So Kabamaru runs off with Lady Akoko to the big city Tokyo to gorge on yakisoba, ramen, chow mein, and attend a regular school—which turns out to have weird quirks of its own.
During a sunny afternoon, Kirarin spots a helpless turtle stuck in a tree. Although Kirarin's mind is always preoccupied with food, she doesn't think twice before saving it; and after the successful rescue, she meets up with the turtle's owner who happens to be a cutie! The guy's name is Seiji and he is actually a famous star! Unfortunately, Seiji's best friend and partner, Hiroto, intrudes on her fantasies claiming that she'd never reach the level of Seiji, and that she should stay away from him. Hiroto's words don't deter her, however; and instead, Kirarin decides to be with Seiji by entering the idol world! However, becoming an idol isn't all fun and games, it's fierce competition, hard work, and filled with rivals!
Mimi Kitagami is the famously attractive, popular chairman of her class, and it’s her dream to become the best class president the school has ever seen. In order to achieve her goal, Mimi will take on any challenge, including agreeing to transform the school’s resident ‘ganguro’, Rika, into a beautiful woman capable of attracting twenty young men to a party. However, it seems she has bitten off more than she can chew when she offers to persuade Toujou, Nishizaki and Nagumono, the trio of super attractive delinquents known as MM3, to join in with class activities; especially when she beings to fall in love with one of them...
Sakura Momoko, who is often referred to as "Chibi Maruko-chan" because of her small size, is a third grade student who lives together with her parents, grandparents and her older sister. At school, her rowdy classmates Ōno and Sugiyama have been best friends for as long as anyone can remember. But after a fight during the sports festival, the two boys begin giving each other the cold shoulder, much to the surprise of Maruko and the rest of her class. What's worse, Ōno is transferring schools. The two best friends must reconcile before it's too late and Maruko is eager to help.
Short, athletic Hikaru Suzuki has just started his first year at junior high school, and things couldn’t be more eventful. He’s reunited with his sisterly childhood friend Chihiro Itou and had a glance at the wealthy, egotistical other Suzuki named Shinobu. However, most importantly, Hikaru’s first day of school yields another life-changing encounter: his first meeting with the shy would-be actress Sayaka Hoshino…