Hanako falls in love for the second time in her life with Kurokawa, who rescued her from falling on a crowded train.

Their proximity grows once she learns they work at the same company. However, still traumatized by her first love, Hanako lacks the courage to take the next step.

One day, she coincidentally overhears Kurokawa talking with his colleagues on the train, and bitter memories of her past resurface.

Convinced she should never have fallen in love, Hanako starts to avoid Kurokawa, only for her ex-boyfriend to reappear before her…