When 12-year-old Riko receives a message that her missing mother might still be alive, she knows that attempting to rescue her could be a one way trip. Because Riko's mom disappeared in the Abyss, a nightmarish gash in the world's crust filled with strange creatures and priceless relics that have lured generations of fortune hunters to their doom. The Abyss is a place where every step deeper risks madness and horrible changes... if you come back at all. But i her mother is still alive down there, then Riko and her robot friend Reg must venture into the darkness, hoping against hope that they can save her in MADE IN ABYSS Season 1!