Suki na Otoko to Wakaretai

Thirty-something Ikuko is dating a useless man who freeloads at her house and doesn't have a regular job. Ikuko tries to break up with him after seeing that there is no bright future with him, but somehow they always end up having sex...!? That’s when a first-rate man who's eyeing Ikuko appears!! A silly love story between a hopeless man and a woman in her thirties!

(Source: Kodansha, translated)