Janai Hou no Yoru (2021)

Original title: じゃない方の夜〜恋は突然、生まれない

Katagiri Shuichi is a university lecturer who has divorced thrice due to his affairs. Despite him having a wife at home, he constantly seeks for new love and always look forward to meeting new women at a wine bar. To fall in love with the women, Shuichi likes to develop love theories with a handsome bartender.