Onidere (オニデレ) is a Japanese manga series written and illustrated by Crystal na Yōsuke.

It was serialized in Shogakukan's Weekly Shōnen Sunday from April 2008 to February 2011, with its chapters collected in 11 tankōbon volumes.

Tadashi Imamoto is in his second year of junior high school and is a member of the handicraft club and loves nothing more than knitting.

Because when Momo was their spy, they know of Tadashi's and Saya's relationship, believing that has something to do with her sudden increase in strength, so their overall plan is to take control of all the gangs in all the schools by inciting the students to protest against mixed sex education, ultimately splitting them up.

Onidere, written and illustrated by Crystal na Yōsuke, was serialized in Shogakukan Weekly Shōnen Sunday April 2, 2008,[3][4] to February 16, 2011.