This release includes a total of 16 songs: 15 singles from their debut song "BRAVE IT OUT" to their latest song "BIG CITY RODEO," plus one new song. The DVD includes all previously released music videos, plus "Y.M.C.A." and a new music video, for a total of 26 videos. The deluxe edition has even more content! The CD includes a bonus disc with cover songs: "Hana," "I Believe In Miracles," "Sora," and "Y.M.C.A.," plus newly recorded covers of EXILE's "SUMMER TIME LOVE," "I Believe," and "Lovers Again." The deluxe edition DVD/Blu-ray includes live footage from "a-nation 2017" & "DANCE EARTH FESTIVAL 2017," and a documentary looking back at their 5-year history. An "International Edition" is also released simultaneously, featuring all the songs from the first best album in English versions! The "International Edition" DVD/Blu-ray includes a documentary of their world tour. Furthermore, a boxed set of "BEST GENERATION" and "BEST GENERATION (International Edition)" is available, featuring a box-exclusive photobook and outer box, making it a super luxurious edition. Thank you for viewing. I have kept this at home. There are some scratches on the outer box. Please understand this before purchasing. Thank you. #Ryota Katayose #Reo Sano #Alan Shirahama #Ryuto Kazuhara #Hayato Komori #Yuta Nakatsuka #Mandy Sekiguchi