Kaguya Nikki

is a Japanese light novel series written by Tensei Hibi, with illustrations by Azuma Masakazu. The series began publication on December 10, 2006 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Kaguya Kawahara, a second-year high school student, is a straightforward girl who hates to lose and is shy and can get her hands out before her mouth. However, for some reason, a refreshing boy, Otori Washiichiro, who transferred to the same class, liked her, and her daily life changed to a romantic comedy flavor! Moreover, it turned out that Otori was a prince in a different world, and the turbulent love pattern and school life began!