Cactus's SecretCactus'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.