after losing her husband and son becoming independent, natsuko felt lonely. a friend introduced her to a matching app. she started using it without knowing anything, but she became close to a 40-year-old man she met there, and they decided to go on a hot spring trip together. at the meeting place, natsuko was nervous. when she turned around after being called out, she saw her son. the two were surprised, but since they had a reservation, they decided to treat it as a family trip and headed to the hot spring inn together.