Two boys meet by chance when both attempt to walk along the white line on the sidewalk. As they become drawn together and choose to walk side by side, how will their unchanging feelings co-exist within a world of changing realities?
Due to an accident, Sakura Hiraga gave up on her dream. She is now married and her husband runs a hair salon. They live in a luxurious penthouse apartment. Her life seems glamorous and she is envied by everyone. What everyone does not know is that Sakura Hiraga is abused physically and verbally by her husband. She is unable to leave her situation. Sakura Hiraga considers herself a goldfish in a fishbowl. One day, due to a goldfish, she meets a man.
Natsuo is a high school boy who is experiencing the crushing despair of unrequited love. To make matters worse, the person he is in love with is his teacher, Hina. In an attempt to lift his spirits, he attends a mixer where he meets a girl named Rui. The two sleep together, expecting never to see one another again, but fate has other plans. His life suddenly becomes more complicated when his father comes home and announces he has remarried a woman with two daughters whom Natsuo has met before: Hina and Rui!