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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.
Miku Yamada has a longtime crush on classmate Kyohei Fujioka. But no matter how many times she tries to show him how she feels, clueless Kyohei just doesn't get it. Frustrated, Miku gives up on him, only to have him start calling her "Cactus" for being prickly when he's around. Will Kyohei ever figure out Cactus's secret?
Miku decides to try telling Kyohei her feelings by giving him chocolates for Valentine's Day. But Kyohei, unaware that he's the object of her affection, offers himself up as a practice partner for her love confession. Can Miku get through to him that he's the one she loves?