“Ours wasn't exactly a welcome marriage...” Nao Kiritani begins. Her husband's relatives are all high achievers, and he is a successful doctor. He married her despite their objections, but now her mother-in-law torments her every day. Her husband knows what is happening yet chooses to look away, leaving her with no one on her side. Crushed by loneliness and stress, she has begun searching for affection from strange men on an adultery site.