Mina and Ayaka have been close friends since high school, bound by a deep connection since their student days. However, after getting married and starting families, their relationship gradually drifted apart. Both women later suffered from their husbands' infidelity and domestic violence, causing emotional pain. Seeking comfort and healing, they turned to each other for support. Eventually, in an attempt to fill the emptiness in their hearts, they found solace in a physical relationship.