I don't know why, but when I see a couple, who behave exactly the same, I just feel disgusted.
To me it feels like twins are flirting with one another.
I would understand why japanese like this, though. Japanese love incest stuff, their whole country is built on that.
@Darklight99 Not really. People are supposed to seek genetic variety, or else their children will be sickly. People are supposed to seek behavioral variety, or else they themselves will be stuck in a boring echo chamber, that probably has yesmen in it. People are supposed to seek gende... I'll stop myself here. But you get my point. It's just the feeling I get on level of my bones. Argue or not, this feeling will remain.
The manga description does mention "Proudly presented to you by the assistant of Miyajima Reiji, author of Kanojo Okarishimasu", so it's understandable that there is some potential resemblance.
@Randomizer No one in real life is an exact copy of another person to begin with. These two are very similar to one another which is why they get along so well. Calling it incest is a huge stretch.