LOL, I hope they used protection! In all seriousness though, since they already agreed here that they would not have any kids, then what is the problem?
no defective babies = no problem
Apparently on her twitter and twitch accounts, the mangaka said that a hypothetical baby of Ritsu and Uta would be called “Kanade”. However, that’s only hypothetical and non-canon. The mangaka will stick to them not having any kids.
I wanted to comment on the incest is bad argument.
While a single generation incest is less healthy than a normal it’s still relatively ok. (With some exceptions) but a second or third generation is when things start getting fucked up.
The reason people always think incest is very unhealthy even for first generation is probably because of royalty and nobels having problems because of this.
Those symptoms happened beacause of multiple generations of incest.
But still remember it’s way more healthy to have a normal relationship both physically and mentally( social discrimination).