>>70359665It's pretty simple, actually. Japanese culture, like any sane culture, finds obesity to be outrageously disgusting. Fat girls are lucky to be treated as second class citizens, so when a guy shows any amount of positive attention to them they overreact. This doesn't go away if they get fit, getting worse as more and more people look at them positively.
Even without firsthand experience with it from being stationed there when I was in the navy, you just need to look at Festival, Fatto Catto, and Omarun. They were horny from the moment they met the audience, but as they've lost weight due to dance lessons and idol culture, they've gotten even hornies.
