World/Gate

there are 3 worlds, these worlds some how got connected to one-another and an all-out war had occurred between the worlds; until one day an entity appeared and some how stopped the war between the worlds. Many centuries has passed and this story about the worlds in war has turned into a myth of legend that tells about a Guardian had appeared to end this war. A Boy named Yuei Shiragi, lived as an apprentice of a dwarf in the world of Gimos. He was born without any magic affinity, so he was considered as the most incompetent. To make up for it he studied alchemy and magecraft; a branch of magic that doesn't necessarily need any affinity, yet having none is a disadvantage in many aspects. He then left and went to another world to study in a magic academy.