Cactus's Secret

Cactus's Secret (サボテンの秘密 Saboten no Himitsu) is a Japanese shōjo manga series written and illustrated by Nana Haruta. The series began serialization in Ribon magazine on December 29, 2003 and ended its run on April 30, 2005. The individual chapters were collected into four tankōbon volumes by Shueisha; the first on August 11, 2004 and the final on October 14, 2005. The series has been licensed by Viz Media for an English-language North American release as part of their Shojo Beat imprint.

Plot
Miku Yamada has liked Kyohei Fujioka since middle school, but once she gets the courage to confess, he thinks it's all a joke. To make things worse, when she gets upset, he calls her a "cactus alien" for being so prickly whenever he's around.