There¡¯s nothing like a bit of time travel to give you some perspective on a relationship. Kanna (Takako Matsu), a 45-year-old widow, is driving along the Shuto Expressway in Tokyo one night when she finds herself transported back to the summer¡¯s day 15 years earlier when she met her future ¡ª and late ¡ª husband, Kakeru (Hokuto Matsumura).

He doesn¡¯t recognize her, of course, but they hit it off anyway ¡ª all of which is a bit complicated. Kanna knows that Kakeru will be meeting her younger self later that day. She¡¯s also aware that their marriage won¡¯t work out. The couple will sign their divorce papers on the morning of Kakeru¡¯s death, in a train accident that provides the bracing curtain raiser for Ayuko Tsukahara¡¯s ¡°First Kiss.¡±

On discovering that her journey back to that fateful day can be repeated, Kanna keeps returning for more, trying to change the course of events that led to Kakeru¡¯s demise. She plots out alternate timelines at home, using strings of sticky notes hung from the ceiling: Maybe she can save him if she prevents him from stopping off at a croquette shop before the accident, or steers him onto a different career path?