Mayumi, who gave birth to twins in her teens and raised them as a single mother. Since last spring, when her son secured a job, she has been living a more stable and peaceful life. However, Mayumi received even better news… Her son had married his childhood friend Rena. Mayumi was delighted to have a cute daughter-in-law, but Rena's feelings were different. Rena had harbored certain 'feelings' towards Mayumi since they were young. It didn't take long for those 'feelings' to explode…
