After my divorce a few years ago, my mother, who raised me single-handedly, was hospitalized. - Satoshi, the only son, was staring at his mother's thinning hand in the hospital room in a daze. - Satoshi is worried about his future and, above all, whether he will be able to pay for his mother's treatment. - Satoshi's aunt Natsuko comes to visit her. - Satoshi is encouraged by Natsuko's words, "It's okay." after meeting her for the first time in a while. - And in such a situation, Satoshi and Natsu are getting closer and closer...