Two boys, whose parents ply their trade by the mouth of a muddy river in Osaka, become close friends.
A ceramic figure of a blue mouse with long ears, stubby legs, and no tail suddenly comes to life. He is a “Manxmouse” as known in the legend. Since he is new to this world, his fearless curiosity leads him to meet a frog couple, an aviator hawk, a stray tiger, and a girl. Although he learns about his ultimate fate-to be eaten by a “Manxcat”-he decides to face this cat and challenge his destiny.
A girl from a wealthy family falls in love with a working-class boy.
