Yume Miru 15

Yume Miru 15 (夢見る 15歳, Yume Miru Fifutīn; "Dreaming 15-Year-Old") is the official debut and first major-label single by Hello! Project idol group S/mileage, and their fifth single overall. The single was released on the Zetima Records label on 26 May 2010, distributed by Pony Canyon, after the group completed the "Smile Campaign" which allowed them to make their major debut. It was released in three editions: a normal edition, and two limited edition versions both containing DVDs. All editions sport different jackets. The limited edition versions, as well as the first press of the normal edition, contained a serial number card, which buyers could use to enter a lottery for tickets to the single's release event. Limited quantities of trading cards were also released with the single, and each type was only available at a certain music shop. An A3 poster featuring the cover of the Limited Edition A version was also available for purchase at some shops. The Single V was released on 2 June.

The song's name is written as "夢見る 15歳", which would usually be read "Yume Miru Jūgo-sai"; however, in this case the title is read "Yume Miru Fifteen".