I think it's gonna be more like Valentines as well.
At least I hope it is, cause it would really explain why they're all so nervous about it.
Although in all likelihood it's just gonna be a unique holiday that's not really analogous to either.
The baseball chalk liner thing he's pulling is called a "sekkai"
She makes a little joke about it being a pain in the butt "osekkai"
puns don't really cross over with translations.