Hyacinthus tells about Hayami's story; her family and her rise to become a heroine, however it will not be easy. The reason: herself. Mysteries, insecurities and very difficult situations will make her made decisions that, rather than bring her closer to her goal, will turn this small and sweet orchid into a dangerous flower that will slowly forget the reasons why she wanted to become a heroine in first place. Will you get to see her becoming the shining heroine she always dreamed off, or will you really see her become a poisonous flower that will slowly fade into the darkness?