Otogi-juushi Akazukin (OVA)

Overview

Long, long time ago there where both science and magic in the human world. But God became afraid of the Human's unlimited potential, so he divided the world into two and sealed them apart. One world with magic and the other one with science. Souta is a normal boy except that he has the "key" in his body to break the "seal." The evil witch Cendrillon want that power and tries to take it. Akazukin and Val, a silver wolf, came from the magic-world to prevent her from that. A grand story of a boy who will lead a checkered life and girls in fairly lands has just begun.

Source: AniList