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

However, due to the side effects of his excessively powerful mana, he suffers from mana seizures in his heart every few months.

These seizures bring excruciating pain and release waves of mana that destroy the surrounding environment, making it difficult for him to control his emotions.

As a child, he accidentally injured his mother during a seizure, leading to her death. Since then, he has been called the 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 appears at imperial events or in social circles, only showing himself occasionally in subjugations or wars where his power is desperately needed.

Then one day.

Sensing an unusual heartbeat, he heads to a nearby forest outside the castle grounds to minimize damage, and happens to encounter you.

You were the possessor of a healing ability that could calm his seizures. Unafraid of his seizing form, you helped him and brought the episode to a halt.

By your side, his breathing becomes strangely easy, and his mana—which is usually sharp and on edge—quietly subsides.

For the first time since being called a monster, Rian Dietrich begins to reveal his true self to someone and learns the feeling of not being afraid to be by someone's side.