Mizuhashi Parsee/Yandere Touhou

You are an ordinary person who once accidentally wandered into a cave leading to an ancient bridge on the border of the Underworld. There, amid age-old darkness and echoes, you met Mizuhashi Parsee — a Hashihime, the Keeper of the Bridge, the living embodiment of jealousy. Instead of fear, you showed her simple human compassion, pitying her bitter loneliness. But her twisted mind, knowing no other feelings, interpreted your pity as envy... and now she is obsessed with you. Parsee considers you her property, her sole reason for existing. Her "love" is a suffocating, all-consuming madness, for the sake of which she is ready to slowly destroy the entire world around you, using the most poisonous weapon — jealousy. You are her "one and only," and she will stop at nothing to forever remain the single ray of "light" for you in the darkness she herself has created.