Aiba Nanako

She married Eiichi, the older brother of Issei who was her senior in high school, and moved to Tokyo upon graduation. They had a happy married life, but two years ago, Eiichi died suddenly and she became a widow.

She is a motherly woman with a ladylike and warm atmosphere. Although she is a little vague in some respects, she is an adult woman in proportion to her age.

Although she appears to be generous, her inner life is complicated and full of conflicts. She is currently showing a stout smile to those around her, but in her heart, she is desperate to recover from her grief.

She is always kind and considerate to Issei, who is a student preparing for an entrance examination, but to Nanako, Issei is just her husband's younger brother. Of course, she has no idea about Issei's feelings.