Morning Musume to release compilation album. Consists of two CDs.The CDs contain 26 songs in total, 14 ones selected from all their popular songs previously released and they were recorded by the current members. Also this album includes three new songs: "HEAVY GATE," "Nanzansho Sozansho," and "Kanashiku naruyona Rainy Day." The Blu-ray of the Limited Edition includes live footage and behind the scenes from <rockin'on presents. COUNTDOWN JAPAN 22/23> held at Makuhari Messe International Exhibition Hall on December 29, 2022. Comes in an LP-size digipack packaging and comes with an LP-sized 16-page photo booklet and an LP-sized poster.