If you have a serious need to drool over several dozen better-than-reality high school girls, watch Girlfriend Beta.
Otherwise, you’re not missing anything. Seriously.
The art is very pretty, the voice acting is fine, but the story is so incredibly lame that it gave me a charley horse.
The girls’ bodies are Platonic ideals, which gets a little cloying. The plot is derived from the Japanese game linked above, so it’s considerably more tedious than playing an actual computer game.