It's 2015. The song came out last year. Avex's latest idol group, unfortunately named, I kid you not, lol. The group's name is lol. WHY. WHY MUST YOU NAME GROUPS SUCH AWFUL NAMES. You really stunt their overseas growth. Japan really is a walled garden - idol groups can flourish within those walls, but are like bonsai - miniature to what they could be.
Regardless, listen to the song and tell me that this doesn't sound like something S Club 7 wouldn't have sang. The co-ed group is a rare sight these days, with idol groups either being all male or female, like AKB48, all female, or Super Junior (are they still around?), the opposite. The resulting sound is fuller than single gender unit. A group of all women will sound higher than they might be individually. A group of all men works similarly. The combination might not sound initially different, but there's definitely a difference between them.
I can't get this song out of my head.