Shūji to Akira
Section::::"Seishun Amigo". Single information. The limited edition consists of three songs and a special 12-page photo booklet, and the regular edition consists three songs and their instrumentals. "Seishun Amigo" was used as the theme song for the drama "Nobuta wo Produce" starring Kamenashi, Yamashita and Maki Horikita. Musically, the song has a resemblance to Japanese "kayōkyoku" music of the 1980s. Chart information. The unit's sole single "Seishun Amigo" was released on November 2, 2005 and debuted at number one on the Oricon singles weekly chart, selling 520,419 copies. It maintained its number one spot the  following week, selling another 250,108 copies. The single sold more than a million copies in less than four weeks and spent a total of sixty-five weeks on the Oricon charts. The single was the best-selling single of 2005 and the third best-selling single of 2006. In 2010, Seishun Amigo was reported by the Oricon's magazine, OriStar, for having sold over 1,627,000 copies and was later certified Million by RIAJ denoting over 1,000,000 shipments. Charts and certifications. Charts Sales and certifications Section::::"Senaka goshi no Chance". Single information. Limited edition 1 consists of one song and its music  video and making-of and a special 8-panel lyrics card, limited edition 2 consists of four songs and three instrumentals and a 24-page lyrics booklet, and the regular edition consists of three songs and their instrumentals. "Senaka goshi no Chance" was used as the theme song for the drama "Boku, Unmei no Hito desu" starring Kamenashi, Yamashita, and Fumino Kimura. Chart information. The single debuted at number one on the Oricon singles weekly chart, selling 175,269 copies. The single spent a total of twenty-three weeks on the Oricon charts. "Senaka goshi no Chance" debuted at number sixty  on the Billboard Japan Hot 100 chart on May 8, 2017. It rose to number forty-one on May 22 and peaked at number one the following week. The song charted for eleven weeks on the Hot 100 chart. The single also topped the Billboard Japan top singles sales chart, selling 188,231 copies in its first week. The single was certified Gold by RIAJ in May 2017.