On April 9, 2000, Suzuki Kyoko receives a phone call from the police. She learns that her 19-year-old son and his friend were killed by a drunk driver while walking along a bridge in Zama. Suzuki Kyoko lost her husband to cancer five years earlier and her world crashes down. The drunk driver was given the maximum sentence at the time 5 1/2 years. Suzuki Kyoko then spearheads a movement to increase the penalty for reckless driving. She also enrolls at Waseda University where her son died just a week after his entrance ceremony. Suzuki Kyoko also starts an exhibit to honor the victims of reckless driving.

最愛の夫に先立たれ、強い絆で結ばれた息子の零と２人で暮らしていた圭子。ある日、大学に入学したばかりの零が、飲酒運転の車にはねられ他界する。しかし加害者は、飲酒運転かつ無免許、再犯にもかかわらず、業務上過失致死傷罪による最高５年の刑にしか問われないのだった。理不尽とも思える現行の法体系に納得いかない圭子は同じ思いを抱く仲間たちと厳罰化へ向けた取り組みを開始する。さらに息子の人生を代わりに生きるため大学への入学を決意するのだった。