The single was released in two formats: the limited edition, which includes a bonus DVD featuring the music video for "Hello", and standard CD-only edition. "Hello" was written and produced by T2ya, marking their third consecutive collaboration. CDJournal described the song as a "lyrical and melancholy ballad." Initially, the song "Ambition", which appears on Ueto's first album Ayaueto, was set to be released as the third single. However, "Hello" was chosen by Ueto instead.
In addition to the title track and its instrumental version, the single includes three remixes. "Hello (Symphony Modulation Style)" was used in commercials for the Lotte ice cream Soh, starring Ueto.
"Hello" entered the Oricon Daily Singles chart at number 6 on February 26, 2003, and climbed to number 5 the following day. It peaked at number 10 on the Oricon Weekly Singles chart, with 22,994 copies sold in its first week. The single was in the chart for nine weeks and has sold a total of 40,555 copies.