Nombre original: 鉄の子
Fecha de estreno: 13 de febrero de 2016
Película
Tiempo promedio: 68 minutos
Géneros: Familia, Drama
Sinopsis: Rikutaro and Mariko are in the same grade at an elementary school. They become brother and sister after Rikutaro's mother and Mariko’s father marry. After their marriage, the children become upset because they are teased by their classmates, so they hatch a plan to make their parents divorce.