Who is Aunt Aya?

Aya is Yuki's aunt and Yuki's mother's sister. It is Aya who comes to Yuki's aid as soon as she hears about Yuki's mother's suicide. She helps Yuki prepare herself for the changes that are about to come upon her. It is also Aya who takes Yuki and raises her during the year between Yuki's mother's death and her father's remarriage. Aya becomes a cross between a big sister and a mother figure for Yuki. Aya ends up marrying a former friend of Yuki's mother.