Tanaka Manabu is a geeky student, on the way to school he meets a girl carrying a bloody bat. That girl is Ryuuzaki Reina, leader of the school's female delinquents. It's love at first sight. A gag manga (with a combination of 4koma and normal page) about having a yankee dere-dere girlfriend.

Note: In the title of this series, "yandere" isn't refering to this term, but to the "yankee"+"dere-dere" combination.

Yandere Kanojo came out in two editions. One is the "magazine version", Yandere Kanojo (Joker); and the other one is the "online version", Yandere Kanojo (Online). Chapters are numbered to follow how they were numbered in the volumes, if you notice the numbers in the chapters don't line up with how they are listed, that is why.