Isn't the siblings' father a novelist? I guess it runs in the female side of the family to target nerdy, introverted (pushover?) types. It remains to be seen whether or not manga prez (really, what is his name here?) becomes successful enough to support and survive Mitaka.
Though it remains to be seen whether or not Mitaka moves forward with it... Given that she is only planning to enter high school at this point IIRC. It would be kind of psychopathic to manipulate or torture a guy, but I think it really just runs in the family.
