Furukawa Shuichi receives a phone call from his mother. She reminds him that they are moving the next day. Shuichi, surprised by this revelation, replies "Oh ... I thought it was next week?"
The following day, Shuichi takes a train ride back to his hometown. He arrives at his parent's home, but nobody is home. He looks for the house key under a potted plant but can't find the key. He starts to think back to his childhood days in his parents home.
Shuichi grew up with his younger brother, older sister, a father who ran a shoe making business out of their garage and mother. Shuichi grew up with a crush on an older woman who lived next door and he loved to make piggy banks out of empty whiskey bottles. One day on a school picnic, Shuichi's classmates grabbed a lunchbox from a fellow student and eventually gave the lunch box to Shuichi. All the other students chanted "throw it away," while Shuichi's former friend looked on in despair.
Back to the present day. Shuichi and his fiance Ayashiro Mary are looking for an apartment to move into. They go to a realtor's office. Shuichi seems strangely distant during the meeting with the real estate agent and to Mary for the next couple of days. Finally, Shuichi tells Mary the story about the lunchbox and how it belonged to the real estate agent ...
(Source: AsianWiki)