In 2004, "Chicken Rice" was released with lyrics written by Matsumoto. The lyrics reflect their childhood (more specifically Matsumoto's childhood) and tells the story about how it was too expensive for them to eat out at restaurants or have nice food, so out of consideration for his parents he would always eat chicken rice as it was the cheapest. The song also asks the rhetorical question "Do children appreciate what their parents do for them nowadays?". This song reached number 2 in the Oricon weekly rankings.