Akira, Yamachan, Shūchan, and Kacchan, four fourth-graders from the Tenjin settlement, set out on an adventure of their own during summer vacation. As they try to fulfill Kacchan's wish to dive into a river while he lives with progressive muscular dystrophy, this children's novel vividly portrays friendship and thoughts about life.

Four fourth-graders step into a summer adventure to fulfill a friend's wish.

Against a setting sun, this picture book follows fleeting moments in a town: children at play, a disappointed girl, and a parent and child returning from shopping. As the seasons pass, the sunset embraces each person's joy and sorrow before a quiet night arrives.

The sunset embraces both joy and sorrow.