Mine Fukaki Se ni Tayutau Uta by Eushully jap

Traces of the great battles between the Law and Chaos have come down to us from the deep past.
One of the ruins, the Root of Distortion, is an intricate labyrinth inhabited by monsters and worse.
The story begins in the city of Ete, a quiet and peaceful place, despite the proximity of the labyrinth.
Knights and Warriors of the surrounding cities and countries explore the labyrinth and protect people from creatures hiding in the darkness.
You play as the son of one of the guards, Fino Sephit, who has decided that it is time for him to explore the depths.