Treated like she is invisible by her husband and son, Yurine knows she has no place at home but feels powerless to change it. She has trouble saying no and is constantly burdened with tedious administrative work at the PTA. Her gray routine changes when she meets newly appointed teacher Nagano. Drawn to him, she begins looking forward to their monthly PTA meetings. Then, during a celebration after a school event, she secretly slips away alone with Nagano and, for the first time, makes the first move herself...