In the midst of exam season, Katsu unexpectedly falls in love—with Yuu, the mother of his best friend. He never imagined developing feelings for his friend's mother, and pursuing a romantic relationship posed a huge risk. Yet, just being able to see her face, he continues visiting his friend's house every day. One day, he discovers Yuu unconscious in the bathroom and rushes to help her. But still dazed from a dream, she mistakes Katsu for her husband... Deepening his inner turmoil, the situation pulls him further into conflict.