In college, Yuuya was dumped by his girlfriend and ever since has struggled with trust issues toward women. One day, Maiko, a marriage counselor and his mother's friend, suddenly appears before him. Reuniting with his long-time crush, his heart begins to race. That night, carried away by drunken impulses, they end up sleeping together. Though Maiko feels guilt, she's drawn by hidden emotions and becomes obsessed with their secret affair. Their relationship gradually deepens, filling the empty spaces in their hearts. Yet, concerned about his future, Maiko wrestles with doubts about their affair—all while unable to suppress her growing feelings for him.