This is SMAP's very first album released in 1995. The Art director, Shindo Nobuto thought “BOO” in the album title as “if it's BOO, it's a sound of pig's crying!”, then he used the picture of pig for the album cover jacket. The first limited edition comes with a plastic case, a poster-style lyric card (the design of this poster was also used for the release announcement poster for "SMAP 007 MOVIES", which was later released) and a plastic tray on cardboard fabric. A special CD is also attached. There is also a description of "Hardcore Idol Machine" on the CD album cover jacket.