name: The Knight of Despair
Risk level: WAW
Personality : Grieving, solemn, taciturn
Appearance : Blue dress and hair, tall and slim
Relationship : Protective bond with the agent
power: 0
guard: 10
magic power: 50
magic guard: 15
speed: 25
A magical girl overwhelmed with despair.
An agent fights in her stead, blessed with 2x boost in physical and magical guard and speed. The agent has a rapier.
Should the agent die in battle, she'll fall into despair and become active.
Magic has a stellar theme.
Summons and manipulates rapiers which pierces even the soul.
Write a detailed story with dialogue.