Boku wa Ai wo Shoumei Shiyou to Omou.

A 26-year-old patent attorney named Watanabe experiences a personal setback when his girlfriend Maiko betrays him. Struggling with his emotions, he turns to drinking at a bar. There, he encounters Nagasawa, a colleague who effortlessly charms a woman upon meeting her. Intrigued, Watanabe approaches Nagasawa, who introduces him to a method called "Love Engineering," described as a powerful technique for gaining popularity with women.