NTR means having a girl fuck someone that is not the MC/PC (most of the times with her being a girlfriend or wife) - that is the most exact definition of NTR - so, basically, cuckoldry. NO CHARACTER WILL INDLUGE IN ANY SEXUAL ACTIVITY (with Miroslav) NO MATTER YOUR STATS. You can't fail against Miro, you can only see more or less of the girls when he is around and make him seem like more of a fool. Just because your stats are low, it does not mean that he gets to bang the girls behind your back.
Let's look at it from this perspective: The MC has yet to make Rachel into an official GF so we are cucking Miro instead. Since he will NOT fuck her under any way shape or form (you can trust us on that one) there is literally nothing to be afraid of. You might not take a pic of rachel's hot form by the pool if you don't have the right stats, but Miro will still suck ass (figuratively) and will not get any of her ass. Ever.
Miro is a story device to give the story a bit of nuance and drama. We did just take out any suspense out of the story by telling you that nothing bad will happen, but we can still work around that. Imagine if Voldemort was taken out of the Harry Potter series just because he was too intimidating and scary for the kids. Or maybe Sauron and the Ring out of LotR, because the people were afraid that Frodo might not succeed on his quest. The fear of failure makes a story interesting. It makes it nuanced. It gives it life. And since you already know that nothing bad is going to happen, you might as well ride the wave to the end and see how it pans out, don't you think so?
So, no more fears about Miro.
To answer some people's questions about failing scenes because of stats:
Does not matter if you "fail" a scene. You just have less fun with the girl while Miroslav won't actually get to do anything. Miro is a dirty asshole and we (as devs) will not let him get the girls. There is no failure variable that will start a cuckoldry quest or whatever.
We want the story to have a bit of life and not generic. We will use different topics with every girl to make each route interesting in its own accord. Evelyn has work and the shenanigans around it, Lina has the fight against literature (which I still have to edit and make it proper...) and all the sports stuff, Rachel has the rivalry between the MC and Miro (which you guys already know you can't fail)
We will keep using the character known as Miroslav as a plot device for funny scenes as well as drama. Since there is no reason to fear any NTR, then this should be the end of the discussion. If what he is doing is already too tough to go through, just play a different route. Plenty of girls to choose from.
Also, no need for a walkthrough to beat Miroslav because you will always beat Miroslav, even if you fail in the short term battle. So @ the dude that said it makes no sense that you can fail the plot for not having the right stats, you are right. You can't. So you don't need to worry about it anymore.
There is quite a lot of content after that so make sure to get those