Sometime ago before the existence of D4DJ franchise, there was a cartoon show about DJing and one of its trailer has a funny ending in which Agetarou mops the table on the same spot as if he's scratching the turntable and then he gets scolded by his father. Somehow, he even gets in serious trouble in one of the earlier episodes in which he blasts the entire music volume out of his bedroom like it's a club to him and his family has received tons of complaints from the neighbors that he gets grounded as a result.
For his first normal DJ mix, he accidentally pauses the music but eventually recovers after that. There's even an upcoming live-action movie that will air in Japan this year but how are you going to watch it due to the on-going pandemic? Popularity-wise, I do get the feeling that D4DJ is going to have even more momentum than the Tonkatsu DJ Agetarou franchise as many nerds will be appreciating it even more than Tonkatsu DJ Agetarou in my opinion. Perhaps, DJs will be interested in both franchises although the D4DJ game is still going backwards in terms of trying to replicating the actual DJing when compared to the upcoming Fuser by Harmonix which is still not perfect in full replication although it is made by them with mashups with mind and even some DJ sites mention Fuser as well.
For the game, D4DJ has the standard 1-Track Gameplay mode as well as the Nonstop-Mix mode in which one song transitions to the next without any silence, a similar kind of game mode other rhythm games have. The gameplay is going to get people skeptical for sure over difficult and complex gameplay like it combines elements from Beatmania IIDX and Sound Voltex with turntable scratch notes and Filter Crossfader. Like Bang Dream Girls Band Party, D4DJ Groovy Mix will have tons of arranged licensed tracks although the song list of licensed tracks seems questionable even to me. Why the songs from those classic arcade shooter games? It doesn't make any sense! Have you ever seen a DJ playing such songs from those games in the DJ venue?
Then comes the original music and the concept of DJ Units. Each unit consists of 4 DJs with one of them being on the booth and the whole unit singing and dancing like an idol unit or some sort. Normally, you'll be seeing one or two DJs on the booth area and most of the DJs are mixing as individuals or duos even if they're part of the bigger group. However, this is another idol-themed franchise mixed with something different this time and it may be a popular reason on why many of the nerds discover and support the hell out of it.
In the present time, D4DJ Groovy Mix is already in Beta stage on mobile with the release date being sometime in Autumn. By then, with tons of licensed and original tracks they're working on, it's going to take tons of time.