>>16997837she's a part of Hoshimeguri. used to be a group that got huge because of ads exposure (Nanana used have the most popular KING cover in her time), but the subs they got were useless and didn't translate to viewers. most of ended up as 2views with 5-digit subs (and Nanana has 135k!)
lesson to take here is never shill yourself through youtube ads.