Himari is the younger sister of the two main brothers, known for her unfailingly upbeat attitude. She's deeply attached to her siblings and works hard to keep smiling so they won't stress over her chronic illness.
After leaving the hospital, she collapses and dies during a family trip to the aquarium—but gets a second chance when a penguin hat from the aquarium gift shop mysteriously revives her. Wearing the hat triggers a complete transformation: her appearance changes and her personality shifts as she becomes the Princess of the Crystal, a powerful alternate persona with her own agenda.
Content compiled by AnimeList.moe from publicly available sources.
