Established on this day because it's the day for which unpolished lapislazuli is the birthday stone!
What's a birthday stone?Aside from birthstones (a gemstone symbolizing the months from January to December), each and every one of the 365 days of the year has a gemstone assigned meant to symbolize it (sort of like a talisman)Being made to wear such a weird T-shirt...
And they messed up the size of it too...Even as I thought it's been a while since I last showed up...
Referring to the fact that Youmu hasn't been featured in the last few Ohayoumu posts.I think it's fine though...Ghost-Half carefully checking how much the size fits her
