Mahou wo Kaketa Oboe wa Nai!!

Our protagonist, Sachiko Sasajima, is still a virgin, even though she will be turning 30 next week. Since she turned 27, she has been afraid of being found out as a virgin at this age, and has been stuck in a negative loop that has prevented her from finding love. She tried her best to get out of this negative loop while she was still in her 20's, but all she meets are shitty men. They say that if you are still a virgin by the time you're 30, you will become a wizard, but will that really happen?! (Source: Kodansha, translated)