Serizawa dozed off while on the job and had a reverie about a past flame whom he had treated wrongly in his middle school days. Later, while on his way back home, he got caught up in a mishap, and an acquaintance who recognized him hailed an ambulance. Currently, this woman has his phone digits, yet Serizawa is clueless about her identity. He evaluates his past romantic involvements, attempting to unravel the mystery of the woman who has resurfaced in his life.