Ren is in a romantic relationship with Emiko, her superior at work. One day, Ren's mother, Ranko, discovers their relationship. Keeping her bisexuality hidden, and drawing from her own past struggles with gender discrimination, Ranko urges her daughter to end the affair. However, Emiko refuses to heed her words. After much internal conflict, Ranko hardens her heart and devises a plan to seduce Emiko herself.