The Devilish Valet(2008)

Akuma na Juuboku

The Princess Cafe, a place where anyone can become a princess. It's there that Shiori, who just went through a break-up, meets the valet Kisaragi. He's kind, and dashing...... "I thought the he was truly the ideal guy, but it turns out he's a former gang member!" At the cafe, he's a gentleman, but, outside the cafe, Shiori is often bullied by Kisaragi. Still, she can't change her feelings towards him... The title story and other included works comprise this sweet Love Comic that is dedicated to all girls who are in love.

(Source: Renta!)