Falling in love with a clueless boy would turn any girl into a cactus!

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?

Now that Kyohei knows Miku likes him, he's turned her down! But Miku isn't going to give up easily. However, Student Council President Itsuki Natsukawa witnesses Miku's rejection by Kyohei and takes matters into his own hands.