Mitsuki hates Hayato. He hates Hayato with that special passion reserved for people that are a little too close to a mirror, a little too much like the viewer. They are nothing alike, he tells himself. The color of their hair, the way they dress, their voices and personalities and especially their glasses are entirely opposite. Hayato doesn't even wear glasses, not real ones. If either of them is a reflection it is Hayato, Mitsuki tells himself, Hayato is the dim echo of himself. He is the real thing.
Getting left behind with him, of all people, is the cruelest thing Soma-senpai could do to Mitsuki. Not that he meant to be cruel, of course, not that he could help it, because surely if he had an option Mitsuki could come to Okinawa too, as a real member of the Glasses Club. He tries to pass the time by going through his scrapbook but Hayato is right there all day, commenting, watching, breathing, and all Mitsuki can think about is that they're together, inextricably linked by the age as secondary members of the club, that he will never be able to erase that connection no matter how hard he tries.
Meeting Hayato's family is...strange. To see those triangular eyebrows and that fall of dark hair repeated three times over instead of just one leaves Mitsuki unbalanced, unsure of his own position, and then Hayato calls him a friend and that hurts, that's exactly what they're not, why can't he see that? Mitsuki would leave if he could, retreat to isolation as better than this forced inclusion, but his protests avail him nothing and then Hayato's brother feeds him and they are all so friendly and kind until Mitsuki can't stand it anymore, lets himself out to sit on the back porch and look up at the stars and just wait for this horrible day to be over.
Hayato follows him out, of course, and Mitsuki has been so irritated all day that he has none left now, so when he opens his mouth a confession pours out of it instead of vitriol. And Hayato just listens, listens and watches him with those stupid fake glasses, and when he talks Mitsuki listens to what he's saying instead of just the nasal whine in his voice, and it's beautiful, it's inspiring and amazing. When he looks up Hayato is backlit by the white of the moon and the glow of the stars, and Mitsuki almost can't see him for the light behind him, and for a second he looks like Soma-senpai.
Mitsuki has always been afraid that he will be the reflection of the two of them, has defended his right to the light from all threats. In Hayato's moonshadow, for the first time, he thinks maybe it might not be so bad to be the moon instead of the sun.