School Rumble Manga is grown-up Azumanga Daioh - the same excellent school comedy, only with more adult characters meaning their problems are not just about studies. School Rumble contains tons of parodies for various movies and animes as well as quotes from them.
Tsukamoto Tenma goes to a high school 2nd grade where she loves her classmate Karasumaru. But she can't confess it to him who is to leave this school soon. So her friends and little sister Yakumo help her reveal her feelings. Tenma also resorts to pretending a nurse or shooting arrows with a love letter attached. Besides, Tenma is cared for by disobedient Harima Kenji who sadly has no chance against Karasumara. After noticing Tenma and Karasumaru at lunch together Harima starts skipping school to improve himself.