Out Flow is a compilation album by Japanese music production unit I've Sound and volume five in their Girls Compilation album series. It was released in a limited edition box set with the Lament album and the I've P.V Collection Vol.3: See You DVD on September 5, 2003. The two albums later received individual releases on October 30, 2003.
The songs on this album come from various adult PC games and CDs they have contributed to. It also includes a new title track sung by Mell. Besides Mell, it features the vocals of Eiko Shimamiya, Kaori Utatsuki, Kotoko, Mami Kawada, Momo and Shiho.
Note: The sales of Lament and Out Flow were totalled together by Oricon.
I've Sound, or simply called I've (アイブ, Aibu), is a Japanese techno/trance music production group based in Sapporo, Hokkaidō, Japan. Led by Kazuya Takase, it features the talents of seasoned "sound creators" and many different female vocalists, known as utahime (歌姫) to their fans.
They have created the theme songs for many Japanese adult games, most famously the opening "Tori no Uta" to the visual novel Air by Key. More recently, they have been creating the theme songs to anime series. Among anime fans, I've Sound is well known for providing the theme songs to such series as Black Lagoon, the Please! franchise (Please Teacher! and Please Twins!), the Shakugan no Shana series, Starship Operators, Higurashi no Naku Koro ni, the Hayate the Combat Butler series, Nanatsuiro Drops, and A Certain Magical Index.
I've was founded in 1998 by members of the six-member Takase Fight. During this time they produced music for tsushin karaoke and adult game brands based in Hokkaidō. They also made two tracks for the Dancemania series, "If You Were Here" by Jennifer and "Is This The Way You Kill A Love" by Gina, both featured in Dance Dance Revolution.