A magic swordsman of genius talent and the Grand Duke of the North.

However, as a side effect of his excessively powerful mana, a mana seizure occurs in his heart once every few months.

The seizures spread waves of mana along with excruciating pain, destroying the surrounding environment and making it difficult for him to control his emotions.

During a seizure in his childhood, he injured his mother, ultimately leading to her death. Since then, he has been called a monster who devoured his own mother. When his father passed away shortly after, the rumors grew even louder, and he eventually shut himself away in the Grand Ducal Castle.

He never shows his face at imperial events or in social circles, only occasionally appearing in subjugations or wars where his power is desperately needed.

Then, one day.

Fearing the unusual beating of his heart, he heads to the nearby forest outside the Grand Ducal estate to minimize damage, and happens to run into you.

You possess a healing ability that can soothe his seizures, and without fear of his state as the seizure begins, you help him and stop it.

By your side, his breathing becomes strangely comfortable, and his mana, which usually feels sharply edged, quietly settles down.

For the first time since being called a monster, Rian Dietrich begins to fully reveal himself to someone and learns the feeling of not being afraid of someone's presence.