Misako Abe, also known as Mamiko Abe, is the girlfriend of high school genius Yutaka Takai. Her being two years older than Yutaka causes him significant distress about their age difference. This concern drives Yutaka to invent a time machine intending to travel back two years and become the same age as Misako.

During the time machine incident, Misako voices concern over the potential consequences of Yutaka's plan, specifically the erasure of his younger self. Seizing an opportunity while Yutaka is distracted, she takes decisive action by using the time machine herself. Setting it to transport her two years into the future, she leaps from the school rooftop while calling out to Yutaka to "Wait for me."

Her disappearance triggers the gradual erasure of her existence from the memories of everyone who knew her, including her family. Yutaka also slowly forgets her, despite his initial efforts to remember. Her actions ensure her planned return exactly two years later at the school, where she reappears as intended.

Her character demonstrates agency and emotional insight, choosing to advance her own timeline rather than allow Yutaka to alter his past. This decision highlights her understanding of the emotional stakes in their relationship and her willingness to endure two years apart for their future together.