The Hoshi no Tama is also known as a star ball. It is usually an union shaped jewel worn around it's owner like a necklace. If the kitsune is separated from it for too long or if it gets shattered, the absence of their life source will slowly drain the life out of it until the kitsune dies. Although the kitsune can be saved if another kitsune sacrifices his or her Hoshi no Tama in exchange for the other's life. It requires a sacrifice. A life for a life. Think of the Hoshi no Tama as the kitsune's heart and soul worn by its owner like jewelry. Noctora isn't the very serious type like this. But I still think it was sweet and well done. And... yeah. I'm not too familiar with male character design. But I'm a boy. I prefer women. So no complaints. And Hanako won't die off. I mean, "she is the main character" and this project isn't the type to get into stuff that dark.