Does no one know what the difference between she and he is anymore? "She" not "he" is what I said. C'mon man. He, the MC, the dude, said he liked the third, hence Miku.
Why do I feel this is yet another web novel author that fell victim to their own popularity and/or the soul crushing authority of their official publisher.
From the prior manga of "we shouldn't have kids" to this one of insemination at all costs. Hano-sensei has upped her game and can never go back now! Kid being real must have been left vague to appease the publisher so as not to offend the masses.