Tatsuya Takumi is a veteran Japanese scientist who specializes in the field of multiverse and all matters related to dimensions. On the day of submitting some research results, he is deliberately pushed to hit an oncoming train. Just when he thought it was the end, his new story begins in the other world.
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Tatsuya will return as a child named Aaron Lionheart from a noble family in medieval Britain and in a world where mana is used as a basic thing for living. Aaron's adventure in this world will be interesting and his attempt to return to his dimension to take revenge.
He will meet friends and enemies who will contribute to his development.