Aho-Girl: Clueless Girl

Aho-Girl: Clueless Girl summary: The manga, in a 4-panel format, portrays Yoshiko, a girl who is genuinely unintelligent (she can even achieve all zeroes in multiple choice tests). At school, she stays with her childhood friend, who she professes to have feelings for, and he must endure her absurd actions. Bonus story: Volume 12: Nandemo Shiteageru (I'd do anything for you.)