Tsubaki divorced her husband 14 years ago, and the two children were split between them: Tsubaki took the older brother, and her ex-husband took the younger brother. As time passed, the children grew up. The elder one found a job and moved out, while the younger one came to live with Tsubaki. Perhaps due to being raised by a strict father, the son never showed any affection towards Tsubaki. Wanting him to feel even a little bit of her love, she invited him on a hot spring trip during a holiday break. However, that inn held a fateful connection for Tsubaki…
