This is a completely different story, another "Big Tits Fantasy 2".
It takes place 150 years before Big Tits Fantasy. It was a time when demons and humans still coexisted.
In the Kingdom of Hillsland, an island country across the sea from the continent of Eurodia, after money came into circulation, the number of demons struggling with money increased,
Demons who had lost their families and possessions began to attack moneylenders, and the gap between humans and demons began to widen.
The government officials were asked to do something about this rift.

Luin Dimidium is from the rural province of Dobrand. His nickname at the royal monastery was "The Ruin Man".
He ranks last in writing, poetry, and magic, but tops in eloquence. He is the only man to have prevented the gifted seminarians from graduating first in all their subjects.
However, he is transferred to the remote town of Boimbala as a military officer (captain of the garrison) instead of a civilian officer, incurring the wrath of Archbishop Alhieff.