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I noticed idol corp recently got a big boost in subs from somewhere (ads, maybe?). The Jewish branch seems to have gotten some subs too, I definitely remember Nikki being below 6k. Anyway it shows that debuting a new branch can boost subs across the entire company because you're bringing in new faces. Hololive take note, this is probably why subs are dead across the entire company.
Looking at Production Kawaii, their lowest subbed new gen member is Sava at 5.44k, I wonder if any of these girls will pass that.