Ok, obviously I'm not an expert for NTR but even after your explanation I don't think I could enjoy it ;-)Alright, I'm a fan of NTR, but I will have to disagree with you, there's nothing to like about Daru x Athena even from that perspective.
I like to equate NTR with the slasher horror genre - it's all about the protagonists being placed in a hopeless situation they have no way of overcoming and just watching them suffer until the story ends. NTR is different from cheating because the characters don't need to be in a romantic relationship, even a one-sided crush is enough to create a good NTR story (conversely, a character cheating isn't necessarily NTR because the husband/boyfriend might not even show up in the story).
This story fails as NTR because we are not exploring the feelings of the guy with one-sided feelings actually being cucked. We're watching things from Daru's POV, and all we see is Est being a dick (to the people that deserve it) here and there while Daru himself acts like a hypocrite at every turn.
NTR is like an emotional roller coaster - the shock of having your pure and wholesome crush being destroyed by someone more proactive than you taking the lead, finding out the girl you believed to be gentle and loyal was a kinky slut that will have sex with everyone else but never you, being forced to watch your significant other r**ed in front of you and realizing she's enjoying it, or any other form of having your lover stolen from you when you could have done something to prevent but couldn't because you were either physically powerless or took too long to act, hence the 寝/Ne (sleep) in 寝取られ/Netorare (having something taken from you while you sleep).
This story fails as an NTR because Est's feelings towards Athena are nothing more than a trigger for him to believe they wanted him gone so they could bang, but after that scene of him misunderstanding things, it's all gone. Clearly the only thing he feels for her is spite now, and since we're not even exploring his POV, the story fails as NTR as well.
So, no, I don't think even NTR fans would enjoy Daru x Athena.
I think the problem with this manga is, even though we don't get any insights to Est's feeling (because he's just a clumsy try of the author to get his idea of the story started and also his biggest mistake) many readers can imagine how he must be feeling. It's easier to empathize with him because his actions make sense regarding the blows he had to take. In my opinion, people (like Daru in the webnovel) who state "that he should have fought harder for her and he deserves this because he is weak" lack a bit of empathy.
Contrary to their "good intentions" the other characters in this story don't act accordingly. They are cold and indifferent (like Daru in the webnovel) and don't even try to reconcile with Est.
Reading this manga feels like cheering for the bullies and blaming the victim because it's his fault that he's being bullied. Sure, they're not actively hurting him but it's clear that the many ambiguous and suggestive actions caused by Daru are mentally hurting him (the readers even more because we can see all his sleazy lines/thoughts which Est luckily can't).
But blaming the victim for being weak (it's his fault that his girl got stolen, he should have been stronger) sadly is a trend in nowadays society.
The author tries to deceive the readers by giving Est op-skills and making his former party the weak victims but everybody knows that Est will be the person who will lose in the end. They will become stronger than him and he will be left with his mental scars.
Est gets nothing (love, fame, friends), Daru gets everything. That's what Est deserves for loving Athena and supporting her all the time (according to the author and some readers). Sure, Athena has no obligation to love him but this is definitely not the destiny he deserves.
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