Soul Master in Gensokyo

Idora Dea was a member of the hero's party that observed the hero's Journey from beginning to end. She was with him when he grew up, and she was there when he was selected as the hero. She was there when he defeated the demon lord. Her contribution to the fight was not inferior to his, but what awaited her at the end wasn't praise, it was scorn. As a withering flower at the end of her life, she didn't regret a single decision, but right before she could pass on to the land of the dead, a blue window appeared in front of her...