Anima and Animus

Synopsis

After the knights train in the mountains to perform a full party Combination Field, a flashback reveals Anima and Animus are orphaned twins from the future. When they were praised for their psychic abilities, Animus developed a god complex before they were sent to the past after he destroyed the Earth with the Biscuit Hammer. During this time, they constantly fought each other over the planet. Sometime later, Anima encountered a young Samidare at the hospital. When they went outside, they met Yuuhi for the first time. Once Samidare returned to the hospital, she wished to see him again and she wanted the Earth. Back in the present, Animus informs the knights he is going to give them a few months' break to prepare for the last battle. (Source: Wikipedia)