『彼氏いない歴＝年齢』じゃ、どうしてイケナイのよ!? ～聖トレア学園恋愛禁止令～

This sex-packed eroge by Hadashi Shoujo stars a cast of girls who are desperate for loving but unable to find a man due to their eccentricities, much like the girls in popular anime Haganai, so they decide to punish happy couples in erotic fashion.

[From J-List]