actually this was announced a couple of weeks ago but wasn't until today we finally got more information, after the announcement the tentative name was "MAMESHiBA NO TAiGUN, TONAi BOUSHO a.k.a MONSTER IDOL" but seems they are going to go by MONSTER IDOL, the name is a reference to the audition show that created both groups also called MONSTER IDOL and that aired on TBS, MAMESHiBA was the group created after the first season in 2019 and TONAi on 2022
the reason behind the creation of the "new" group was because both groups lost half of their members, MAMESHiBA was down to 2 from 5 original members (although we knew since 2022 that some of them were going to leave the next year) TONAi was down to 1 from 3 original members with the second one leaving just a few weeks ago so it makes sense to merge the groups specially since both were supposed to be rival groups and have been touring together for most of last year
if curious about the previous names MAMESHiBA NO TAiGUN means "small horde of shiba inus" and TONAi BOUSHO means "somewhere in tokyo", in their first performance they played a setlist combining songs from both groups so thankfully their discography is not going to dissapear, while both groups have SNS accounts the group is going to start using the one from MAMESHiBA and also their youtube channel along their Youtube series is going to be taken over by MONSTER IDOL
both groups have pretty good debuts so hopefully their upcoming is just as good