Kosodate: Hitori Ikuji wa Genkai desu

Hikari lives with her husband and newborn son. While her husband, Eita, was initially supportive of childcare, he gradually began to leave everything to Hikari. Reaching her limit as a single parent, Hikari asks Eita for help and decides to hire a housekeeper. But the housekeeper turns out to be the man she had a crush on back in her student days...!?

(Source: Shogakukan, translated)