@Gambino
Might as well ask - why do you (and others) think Chika is "annoying female lead"? Honestly curious here because I have yet to read any meaningful comment on the matter.
And before anyone asks, yes there have been times where she's been clingy and whiny with Hirota, but if Souichi had any meaningful character development, it's exactly because this "annoying female lead" has had the heart to be kind to him (and if that counts as NTR for anyone, that's laughable at best).
While I thik (I hope) everyone here has a working brain on their shoulders, I can't completely disagree with
@kazaddum's comment. :/