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> Riena is being overexploited meaning (ironically) the higher-ups likely trust her 
That's prolly true but she might get tired of it if they don't let her rest enough and give her a pet project she really likes (something involving soccer, baseball or English). She is also the most likely to marry a foreigner (not an incel nor a cashless chronically online loser, very unlikely a dimwitted chauvinist sportsman either, she's too smart to deal with these kinds of blokes) so if the guy decides to leave Japan she might either follow him or divorce.