Undo-kai is Japan’s school Sports Day, but it is not simply a day of races and games. It is a cultural event where children learn how to exist within a group.Rather than celebrating individual winners, undo-kai focuses on cooperation, shared roles, and the experience of striving together.This article explains what undo-kai really is, why it matters socially, and how it shapes values that carry into adult life. What Is Undo-kai? Undo-kai is an annual school event where students, teachers, and families gather to participate in physical activities as a school community. While it may resemble a sports festival, its purpose ...