If you're gonna watch this anime, I suggest you play the Visual novel first rather than watching this first. I watched the anime first and I didn't get the story at the beginning but when I finished the VN, I rewatched the anime and finally understood.
Story: 7/10
The beginning of the episode 1, it was rather nice to see fighting already. It was a like a sequel to Momoyo's route in the VN. That's why I recommended to play it first than watch this.
Art: 9/10
The art was really amusing and was very admirable. I like how they used almost the same art from the VN, compared to Yosuga no Sora.
Voice/sound: 8/10
I gave it an 8 because the seiyuus is not from the actual VN. But they're almost as good as the seiyuus from the VN. The OP and ED was amazing. Since I am a big music lover, the way the harmony in the OP was very nice. The second voicing of the male is very good. The ED is also nice since it is KOTOKO, and KOTOKO is also the same singer for the VN ED.
Character: 10/10
They are the same as the ones from the VN. No side comments. I love them as they are.
Enjoyment: 8/10
I enjoyed it less than I expected due to no explanation on how the story started if you've never played the VN.
Overall: 8/10
It was rather good and bad at the same time. It was good because of the Art, Sound, and Character. But it was also bad because Story and Enjoyment.