Namaiki Little Prince

Umeko, a 22 year old woman who works at a gal-type apparel shop, is liked by Eishiro (12 years old), a popular child actor and model, and they unexpectedly end up living together! What will happen to Umeko's life when she's at the mercy of a selfish prince-like child who isn't her type at all?! A slapstick romantic comedy between an innocent gal and a cheeky elementary school student begins!

(Source: Futabasha, translated)