After passing through that door, there is a different world in front of you——
Setsuna Kamiya is just an ordinary high school student.
However, due to an accidental opportunity, Setsuna was summoned to a different world called Ila Val, and was involved in a war-filled Warring States Period.
The moment he awakened the Armed Summoning Technique and became a user of the Black Spear, he met Faria, the Armed Summoner, and Leongund, the young king of the small country of Gandia, and others, and then he devoted himself to one battle after another.
But he had no idea that after countless battles, countless encounters and partings would be waiting for him...
