"Beautiful Days" is the twenty-fourth single from the Japanese boy band Arashi. It was used as the theme song for the drama Ryūsei no Kizuna, starring Arashi member Kazunari Ninomiya.

"Believe" / "Kumorinochi, Kaisei" is a single released by Japanese boy band Arashi. It was released on March 4, 2009 through their record label J Storm. "Believe" was used as the theme song for the Takashi Miike movie Yatterman starring Arashi member Sho Sakurai, and "Kumorinochi Kaisei" was used as the theme song for the drama Uta no Oniisan starring member Satoshi Ohno. The single was released in three editions: a regular edition containing a bonus track and instrumental versions of all the songs released in the single, and two limited edition both containing a DVD with a music video of one of the A-side tracks.