Masashi Sekito

Detective Kamei of the First Investigation Division receives a request from lawyer Shinichi Nakamura, the son of his deceased close friend, to re-investigate a car accident. Akiko, the wife of Yasuo Furuki, a painter from Hakone, died in the accident 5 months earlier by crashing into a guardrail. Nakamura's client, Akiko's younger sister Yuki Izeki, suspects that she was actually murdered by Furuki for insurance money. Overwhelmed by these thoughts, Yuki had sent an email reading "I'll never forgive that man. I'm going to kill him and avenge my big sister," announcing a murder to Nakamura. In the middle of their conversation, Nakamura receives a call from Hakone PD confirming that Yuki had turned herself in that morning...

中学教師の宮本陽平とその妻・美代子は結婚27年目。ひとり息子の正が結婚して安堵する一方、ここ1年通っている料理教室が楽しい陽平は、家で妻と2人きりになると、酔いつぶれた美代子の姿に老いを感じることも増えていた。ある夜、何げなく本棚を物色した陽平は、若き日に初めて美代子に貸した本「暗夜行路」を見つけ、あまりの懐かしさに手を伸ばす。するとページの間から、美代子が捺印を済ませた離婚届が見つかる。