New Jersey teen Daniel LaRusso moves to Los Angeles with his mother, and soon strikes up a relationship with Ali. He quickly finds himself the target of bullying by a group of thugs, led by Ali's ex-boyfriend Johnny, who study karate at the Cobra Kai dojo under ruthless sensei John Kreese. Fortunately, Daniel befriends Mr. Miyagi, an unassuming repairman who just happens to be a martial arts master himself. Miyagi takes Daniel under his wing, training him in a more compassionate form of karate for self-defense and, later, preparing him to compete against the brutal Cobra Kai.

During the summer of 1999, a group of teenagers, through interconnected narratives, live through their last day of high school and prepare for the future. Holly, once the new girl in school, does whatever it takes to remain popular. Dawn, who is secretly a lesbian, battles drugs. Tori is the valedictorian of her class, but, on the eve of graduation, she decides to experiment with drugs for the first time.

The Amamiya Brothers, Masaki and Hiroto, keep looking for their older brother Takeru who disappeared one year ago. The three Amamiya brothers lost their parents when they were young. Since then, they relied only on each other. On the anniversary of their parents' death, Masaki and Hiroto expect Takeru to appear. Instead, they meet a person who has a clue on Takeru's whereabouts.

High school student Asako moves all of her belongings to the refuse area of her apartment complex and stops attending school. Kazuyoshi, a precocious young boy, invites her to join him in an online chatroom venture where she assumes the identity of a married temptress named "Miyabi".

The first chapter of the Refrain Blue series, tells about the recollection of Yoshihiro's past about various events of summer school, of the fate where encounter and separation are interwoven with each other, as Yoshiro and Matsunaga will pass the Toyo Gakuen and will arrive at summer school at seashore. A mysterious girl smiles as she watches Yoshiro who stands still at the seashore dusk.

In the last chapter of the Refrain Blue series, the bond between Yoshihiro Matsunaga and Nao Morisawa grows stronger, while Yoshihiro finally finds out the identify of the mysterious girl from the first chapter.

High school student Naoki Tomura grew up in a remote area in Hokkaido. He meets piano tuner Soichiro Itadori in school and eventually decides to work at Itadori’s musical instrument store. Tomura gradually grows as a piano tuner through his interactions with the other tuners and musician clients

With the help of their high school's newest teacher, four Hispanic students form a robotics club. Although they have no experience, the youths set their sights on a national robotics contest. With $800 and parts scavenged from old cars, they build a robot and compete against reigning champion MIT. Along the way, the students learn not only how to build a robot but something far more important: how to forge bonds that will last a lifetime.

Saori, a school girl, is molested on the notorious "molester train" of the Hanagawa line and rescued by another school girl who witnesses the act. The girl who rescues her turned out to be a new student of the same high school Saori attends. The mysterious new student Yuriko is rumoured to be a "parent killer". Yuriko then leads Saori and her friends to hunt molesters.

As seniors in high school, Troy and Gabriella struggle with the idea of being separated from one another as college approaches. Along with the rest of the Wildcats, they stage a spring musical to address their experiences, hopes and fears about their future.

A single mother living in inner city Chicago, Brenda has been struggling for years to make ends meet and keep her three kids off the street. When she's laid off with no warning, she starts losing hope for the first time - until a letter arrives announcing the death of a father she's never met. Desperate for any kind of help, Brenda takes her family to Georgia for the funeral, but nothing could have prepared her for the Browns, her father's fun-loving, crass Southern clan. In a small-town world full of long afternoons and country fairs, Brenda struggles to get to know the family she never knew existed... and finds a brand new romance that just might change her life.

Kobayashi Isamu, a first-year high school student, lives in a family of four with his father, an artist, his mother, an insurance agent, and his sister, an office worker. To make ends meet, he works as a milkman. At school, he is a member of the kendo club and spends his days working out with his seniors. Over time, he has various encounters with a series of girls.