About Tales of Phantasia: Narikiri Dungeon

The story begins when what appears to be a shooting star lands in the mountains. A pair of twin babies are found, a boy named Dio, and a girl named Mel.

The story skips ahead thirteen years to 4408 by the Aselia Calendar. Dio enters with a strange creature that followed him home from the mountains. He and Mel decide to keep it as a pet and name it Kruelle based on the sound it makes. Kruelle begins as a green bipedal creature who is roughly waist-high, but it is actually a shape-shifter whose forms change based on its power and mood.

Mel and Dio start to go about their day as normal when they are suddenly visited by a winged woman who introduces herself as Norn and says that the two of them have a doomed destiny. With little else in the way of explanation, she sends them to meet Arche, the only surviving time warrior made famous by the events in Tales of Phantasia.