Yurika is a housewife with a husband and son. She asks her nurse sister for help, requesting to take care of her high school son, Haru, for dinner during her night shifts. Haru then frequently visits Yurika's home… Her long-lost nephew retains both his childhood stubbornness and his reliable, masculine charm… Watching him enjoy her cooking and observing his ambiguous words and actions, Yurika develops feelings different from maternal. Then, on the night her husband's infidelity is discovered, Yurika is unexpectedly embraced by the concerned Haru, and the two cross a line.