Hori-san to Miyamura-kun

Hori-san to Miyamura-kun (堀さんと宮村くん) is a 4-panel web comic and the original story of the manga series, Horimiya. It is written and illustrated by HERO, and was serialized on her website in Febuary 2007. Square Enix compiled the chapters into 10 volumes, released between October 22, 2008 and December 28, 2011.

Description
People say that the youthful days are always bittersweet, but maybe it's just bitter? Kyouko Hori is a flashy high school girl, who, despite her ostentatious appearance, excels in academics and has a family-loving character. Izumi Miyamura is a bland high school boy, who, despite not wanting to stand out in class, secretly wears piercings outside of school and has a large body tattoo. One day, Miyamura finds Hori's little brother injured and helps him back to Hori's house, where the relationship between Hori and Miyamura begins with Hori's discovery of Miyamura's secret.