Ryoko Shiroyama is a 31-year-old woman with neck-length black hair, she has purple eyes. She works with her husband Shinji at the "Shiroyama Sake Shop", a local shop that belongs to her husband. Ryoko is very kind, attentive and hard-working, besides being a good wife, she also cares about her employees. She hopes to have a baby one day, however her husband is infertile.