Sing-along sold about 198K copies in the 1st week of release
With this , JUMP now has #31 straight number 1 singles
https://www.oricon.co.jp/news/2215668/full/
I'm still a bit on the fence on Sing-along as I feel it's like Asu e no YELL 2.0 so if you like or don't like that song , it all depends
Break The Wall is great but I could see why it's slotted as B-side instead of A-side cos it's almost in the same music vein as Gunjou Runaway
Hello Melody is good . I don't know about the other 2 B-sides yet :s