Obocchama-kun

Chama comes to school after a long time and is very angry with Kakino. The reason is that Kakino has not returned the one yen Chama lent him. Why would the son of the Obo family, a very wealthy family, get angry over just one yen? It had something to do with the Obo family's philosophy. This is the story of the birth of a new Chama language, “friend-rich.”

Chama gets a cavity. In the Obo family, it is said that for generations, cavities grow huge and become fangs, and then fall out. However, Chama's fang keeps growing bigger and bigger, but cannot be pulled out. After much trial and error, they even mobilize a fighter jet to try to pull out Chama's tooth.

Chama gets a 40 on a test. He thought he would be praised by his father, but Kamemitsu says that he only accepts a score of zero, which has unlimited possibilities. Chama gets sulky and shuts himself inside. Kakino and the others try various ways to get Chama out of the room.

When Chama's body is examined with ultrasound, it is found that he is pregnant. The media comes and everyone is in a panic. To make sure Chama's body is safe, he goes to school in bed. Chama goes into labor in just three days. What in the world was born?

Fukurokouji comes to school on the biting turtles to compete with Chama. However, everyone around him is cold. Angry, Fukurokouji uses the biting turtles to make a surprise attack on the Obo family turtles. In order to fight back, Chama decides to awaken the giant turtle Gameron, who sleeps at the bottom of the Obo family's pond.

Chama and Kakino are late to school. Mr. Subaruta closes the gate and tells them to stand there for the rest of the day. A fierce battle begins between Chama, who will do whatever it takes to get in, and Subaruta.

A great adventure in the astonishing microworld!　In order to treat Daddy who suddenly collapsed, Chama and his friends become small with microbeam and go inside his body!

The Obo Family Karuta Tournament is a battle for the kites in the sky!? In the midst of a storm, crows and a UFO also intervene, and a great battle unfolds!

An underwear with artificial intelligence was developed for Chama. It supports Chama's school life, but gradually tries to dominate him. However, the AI underwear is taken aback at Chama's unpredictable counterattacks. Eventually, a friendship develops between the AI underwear and Chama.