One day, a wizard claiming to be a "love cupid" named Riri appears before Anzu Hoshino, a high school girl who has no interest in romance outside of video game characters.

The world where Riri comes from is founded on giving dreams and hopes to children, and collecting their pure hearts as energy in return.

Along the way, Anzu establishes genuine connections with the romantic candidates, and has to navigate their feelings - and her desire to protect them from Riri's schemes - with increased difficulty.

Written and illustrated by Wataru Momose, Romantic Killer was serialized in Shueisha's Shōnen Jump+ website from July 30, 2019,[11] to June 2, 2020.

It is produced by DOMERICA and directed by Kazuya Ichikawa, with Sayuri Ōba and Hiroko Fukuda overseeing the scripts, Arisa Matsuura designing the characters, and Ryo Kawasaki and Tomoyuki Kono composing the music.