ニイハオ！称好

There is a legend that it's possible to become a wizard upon reaching 25 years and remaining virgin. Main character witnesses magic abilities of a 47-year office worker, so decides to become a wizard as well. Besides, he is 24 year and 11 months old already. However, he develops really promising relations with a girl he likes, so he has to choose which path to take. At the same time three maidens appear who want to stop protagonist from becoming a wizard and thus try to seduce him with all means possible. Can he protect his precious virginity !?

[From vndbreview]