Akiho Sairenji

Akiho Sairenji is Haruna's older sister. Due to their parents moving away, Haruna decided to stay living with her older sister in her apartment instead. Akiho is a reasonably tall and highly attractive woman with long purple hair and eyes. Akiho is very mature, though in an adult-like way, and she is a casual dater. She enjoys dating boys, but has no desire for a serious relationship, and only intends to "play with them for a while". Source: To Love-Ru Wikia