Noriko Sakisaka serves as the older sister to Saki Sakisaka. She shares a past romantic involvement with Kaname Kazame, a relationship concluded before the main storyline begins. This concluded romance directly fuels Saki's internal struggle concerning her own feelings for Kaname. The termination of Noriko and Kaname's relationship happens without Saki's awareness, establishing a misunderstanding that shapes Saki's subsequent actions. Within the narrative, Noriko's presence is defined principally through her connections to other characters rather than active participation. Her parents are Mr. and Mrs. Sakisaka, though specific aspects of their family dynamics remain unspecified.