Cobalt, Chrom, Kei, and Neon are androids living together in an abandoned house. In order to pay off a huge electrical bill, the four decide to compete for prize money at the Babel entertainment tower. After their first performance, they meet Esora, a boy struggling with the recent loss of his father. The encounter activates a special program within the four androids.
Maybe they don't want to forget their 
happy memories. Could that be it?
لعلّ السبب أنّهم لا يودّون
نسيان ذكرياتهم السعيدة
Wahrscheinlich, weil sie schöne
Erinnerungen nicht vergessen wollen.
Tal vez porque no quieren olvidar
sus recuerdos felices.
Tal vez porque no quieren olvidar
sus recuerdos más felices.
Sans doute pour ne pas oublier
leurs souvenirs amusants.
Credo sia perché non vogliono dimenticare
Talvez eles não queiram
esquecer suas memórias felizes.
Может, они просто не хотят забывать
счастливые моменты.