ROM² Karaoke Vol. 4: Choito Otona!? is the fourth in the series of karaoke discs by Victor Musical Industries. Songs are played on different backgrounds, some of which display digitized photos, while others feature hand-drawn graphics. Backgrounds may dynamically change with the song.

This volume includes the following songs:

Suki
Tonbo
Single Again
Aoi Kaze
Dance If You Want It
Woman
Main Street
Return to Myself
I'm Dandy
Kaze no Aeolia

In addition, this volume includes three mini-games: Bingo, a simple luck-depending lottery draw; Shinkei Suijaku, in which the player has to match pairs of tiles; and Cockroach, a top-down arcade-style game for up to four players.