I'm guessing that she is a idol in a group and fell in popularity or something and is getting blackmailed from the company president and executives into doign sex with them for keeping the spot in the group, or maybe they discovered she was going out with her producer and as "a idol can't have a boyfriend" they blakmailed her with that because it would ruin both, she ended up fucking severla fat bastards and at the end is haivng a date with the producer but stil lgetting messages that must go in hotel rooms to have sex with the bastards. Withotu a TL I don't know if she is getting blakmailed with the producer job after she graduate from the job, fell for the sex but wants to keep a normal boyfriend or something else, as she wa shaving a open date I believe she stopped working.
Edit: used a google lesn for more or less udnerstanding what happened, seems liek she is old as a idol and is having sex to keep her spot, when the bastard at the end put the phone up is to make her see how Producer wants to have a date they after, she received a message about having to fuck again in a hotel ina couple days, the NTR wil lnot stop...seems like she doesn't liek to fuck with them but there is nothing she can do...they filmed her too, of course, blakmail sex wil lruin them too, but i fis only her and some dicks on video there wil be no problem for the bastards.