Thread:Ntnd/@comment-25308539-20160405124714/@comment-26843868-20160405192742

Cool. http://d.hatena.ne.jp/junluvdonuts/20120326/1332769585 has some stuff.

In the fourth volume of the manga, there's pictures of all the characters with flowers. It looks like what's going on is that the flowers in the pictures look like birth flowers for the days everyone with confirmed birthdays was born on.

So, the flower in Jun's picture has been identified, and by googling some variations on the flower name, this poster seems to have decided that the 13th was a good choice [Edit: Actually, that's not right at all. They say they though it'd surely be the 13th, but the statistics say the 18th is more likely. They don't know what to make of this.]. They have graphs of appearance rates of dates in their searching on the page, and I'm not going to argue with those results.

So yeah, we're looking at April 8th, 13th, or 18th.... I think.