Read the Manga. It starts as the same cringe comedy the anime is, but slowly develops into one of those "how gay can we make this before we have to rebrand" type series.
The subtext buildup between these two is forming a yuri singularity, which draws everyones hopes and dreams in and, upon release, will release a yuri wave so powerful it’ll cause the entire town to become lesbians.
I'm looking for a story where the girl limits herself from touching her friend to 3 times a day, so as to hide her crush. I think sweets are involved, but I'm not positive.
Oh come on, this bonus episode isn't even TRYING to hide it! At least tag this bonus as Yuri!
It has blatant flirting, an open crush, and freaking VALENTINES DAY for pete's sake!