"NTR" does not mean what you think in this case. "Netorare" aka NTR is when one of the people in a romantic couple has their feelings and affections change towards another person through the act of sex.
Takumi and Miu in this case have no romantic relationship whatsoever, since Takumi's affections have always been for Ayako in the first place, and there's no sex involved in any way. Calling what happened "NTR" is just inaccurate misuse of the term. It's like if someone punches you, and then you say you've been shot by a gun.
Just covering my bases, since I've seen the term "NTR" used way too much to refer to things that are not NTR. It's especially sad when people throw around "OMG THIS MANGA HAS NTR!" and people seeing said messages get turned off reading the manga despite the actual story not having any NTR at all.
@KoreJi I also read the novel ahead...... man, the banter is just so good. I gained a lot of contemplation material, even questioning myself "what is an adult? What is common sense?". I have a feeling there should be a drama show somewhere with this exact same premise...... or not?
To you guys out there, yes, this manga got 8.5 stars for a reason.
@LGear tbh by their logic 99% of shoujo/josei manga has NTR cause the SL always comes at the middle to try and steal the FL. And if you want to go deeper Childhood friends are all NTR protagonist
the only reason why they don’t call it NTR cause the target audience is not Male or the one getting cucked is a girl a bit if a double standard I guess but at least when the girl gets cucked the readers sympathize(a number of villainess starts with MC getting NTRed if you think hard enough) but if a guy gets NTRed people hate him like calling him a simp or incel those words seems to be interchangeable nowadays.