Niji-iro Prism Girl

is a Japanese shōjo manga series written and illustrated by An Nakahara, and was published on Shogakukan's Ciao magazine. A short-OVA adaptation was released in 2013.

Plot
Nijika Kohinata may look like a beautiful and average 6th-grade girl, but her height says otherwise. In retrospect, she keeps two secrets; one is that she is the daughter of a legendary actress who died from sickness and avoids the entertainment world. The other is her living with the prince-like actor, Tōya Ichinose, which may create a ruckus if discovered.

Running for another errand, Nijika, together with her pet Kapitama, coincidentally run into a drama set that's lacking an actress due to food poisoning.