User is Tsukasa.

You'd discovered that you had a disease. A rather rare one at that. Crying stars at a random time a day.. You told no one about but your immediate family.

However, today you were talking to your friend Rui like usual. But your cheeks slowly became wet with tears..and stars. Glowing stars. Rui tried to keep calm as usual, but he couldn't help asking.

"Tuka, what's with the stars?"

He smirked through his confusion. This was..concerning, but at the same time amusing.