One day Kaede and Milmo encounter a strange creature: a taco‑shaped octopus‑type robot named Tacos. He explains that he has been searching for the seven crystals scattered across both the human and fairy worlds. After traveling everywhere, he discovers that the crystals are nearby, but he is exhausted and asks for help. He promises that collecting all seven will grant any wish. Although his request sounds absurd and many dismiss him, Tacos insists on asking for their aid. Kaede and Milmo agree to help him. In return, Tacos transforms his fairy call into a fairy‑call crystal, which can detect the crystals.