Momoko, who attends a special school, is both mentally and physically disabled. Every morning she becomes peevish because she cant go to the ordinary school with her twin brother Riki. Her family soothes Momoko by singing her favorite song The Song of Frogs.

One day, Momoko shouts encouragement to Riki whos playing dodgeball at an open classroom day and Rikis team wins the game. Ryuji, whose team lost the game, is not impressed and demands that Riki stop bringing his idiot sister to school. Riki totally loses control and hits Ryuji with all his might.

The following year, an experiment in integrated education is implemented and Momoko begins to attend Rikis school. Unfortunately, her physical condition takes a turn for the worse and shes sent to a hospital. Riki and all her classmates want to cheer her up and they set a goal of winning a relay race so that they would be able to tell Momoko the good news. Meanwhile, the fastest sprinter, Ryuichi, insists that he wont be taking part in the race.

(Source: Eleven Arts)