Batsu 3 na no de Tokimeki Kinshi desu

If you let your guard down, you will accidentally fall in love. Never again will my heart flutter with anyone from many failures! I vowed in my heart that I would live an unobtrusive and plain life.

However, the sales department's handsome ace, Chief Ichigaya, has his eye on her, and he is attacked fiercely! ? A love battle between 3 women who are prohibited from dating and a man who absolutely wants to be corrupted begins.

(Source: mangaupdates.com)