A TV special movie aired in Japan.

Sakai's Happiness is a humorous and bittersweet portrayal of an ordinary family dealing with the challenges of everyday life.

Katsuya Maruyama is a middle school student boy full of obscene thoughts. He then meets Tatsuo Shimoi, a single father who moves into the same apartment complex. Tatsuo Shimoi is a bit of an enigma: he doesn't get along with the housewives in the apartment complex and doesn't appear to work. Through his encounter with the mysterious single father, Katsuya grows as a person.

New student Kanji transfers to 6th grade 2 class, where Ayami Mutoi works as the homeroom teacher. Students begin to talk among themselves that they have seen new transfer student Kanji in a dream. Yuiko Koto also had a night mare. In her nightmare, a boy that looks transfer student Kanji appeared as a prince. Ayami Mutoi tries to keep that to herself. She actually likes the prince in her dream.

In a poor district of Edo lives a young samurai named Soza. He has been sent by his clan to avenge the death of his father. He isn't an accomplished swordsman however, and he prefers sharing the life of the residents, teaching the kids how to write etc. When he finally finds the man he is looking for, he will have to decide whether he follows the way of the samurai or chooses peace and reconciliation.