Natsuko and Kyosuke make love to each other on the banks of the cherry blossom bus stop. Kyosuke is 43 years old and has a wife and children... Natsuko is his wife's younger sister. Although there is a sense of guilt in the two who continue the forbidden relationship, they cannot cut off the physical relationship. The only 'time to confirm their love' for the two was 30 minutes waiting for the bus.