JK wa yukionna (2015)

A love story between Snow Women sisters and a male high school student. Saki Fuyuki is a female high school student, but she comes from a family that has the blood of Snow Woman. To revive her family, she is expected to have a baby with Ryunosuke Shiba. He is the prince of the most powerful family in the human world, but Saki is attracted to Rei Ando. Rei possesses a warm personality that Ryunosuke lacks. His family has served for Ryunosuke's powerful family for generations. Rei is also human unlike Saki. Meanwhile, Koyuki is Saki's younger sister. She is a middle school student, but enters the high school where Saki attends. Koyuki struggles to protect her older sister.