Hiwako Hoshikawa

Hiwako Hoshikawa (星川 ひわこ Hoshikawa Hiwako) is the mother of Hisui Hoshikawa.

Biography
Hiwako was born in a wealthy noble family where she and Shouko Shiginuma used to attend an all-girls school together and became good friends before Hiwako’s family fell into ruins. When that happened, in order to take care of her siblings, she knew that she was going to enter a different life. She cut all her ties with her family and sacrificed everything and sold her body in the red-light district, where she met Hamel Hans they secretly begin to have feelings and Hisui was eventually born. Shouko was in contact with Hiwako but lost contact with her. Due to some problems Hiwako and Hamel got separate and lost contact. When Hisui got a power and almost killed a customer and burn the brothel. Professor Mozuyama wanted to experiment on Hisui but she plead to him and took Hiwako instead of Hisui. She offered herself to Mozuyama as a labrat in order to leave Hisui alone from being used as a testsubject. In the end, it ended up killing her because she got weak and dies of blood loss.

Etymology

 * Hiwako's surname Hoshikawa means "star" (星) (hoshi) and "river, stream" (川) (kawa).