Horimiya

Horimiya by Hero

Hori may seem like a normal teenage girl, but she's a completely different person after school. In her workaholic parents' absence, Hori has been like a parent for her little brother since she was young herself. Between taking care of her brother, feeding them both, and housework, she doesn't have much time for a usual teenage social life. One day, she meets someone else who does not present his true self at school: a quiet, glasses-wearing boy called Miyamura. She'd assumed he was bookish, and possibly an otaku, but Hori couldn't have been more wrong. Outside of school, Miyamura is a friendly guy with many piercings, and he's not very good at academics. Now the two of them have someone with whom they can share both halves of their lives!

Read manga here: Horimiya

Kaichou wa Maid-sama!

From Tokyopop:

 Brilliant and overachieving, Misaki Ayuzawa is the President of the Student Council at Seika High School, formerly a boys' school. Unfortunately, most of the students are still male and stuck in their slovenly habits, so man-hating Misaki really socks it to 'em in an attempt to make the school presentable to attract more female students. But what will she do when the sexiest boy in school finds out that after school, Misaki works in a maid cafe.

Read manga here: Kaichou wa Maid-sama!