Hiyopiyo Enikki.

is a japanese 4-koma manga series written by Kotohisa Kao. It began serialisation in the July 2009 issue of Manga Time Kirara Carat.

The series was released under 2 volumes from March 2010 to March 2011.

Synopsis
Chiaki and Haru are close sisters who are older than each other. Chiaki, a fifth grader, struggles every day for her young Haru !! "Because I'm Haru's older sister!". Good luck Chiaki, and Chiaki's heart-full sister story are finally published in a book!