Kyoutaro Ichikawa may look like your average middle school student, but in his heart, he dreams of murder. Thus, it is no surprise that the one he wants to kill the most is never far off from his mind: the class idol, Anna Yamada.

Reading alone in his beloved school library, he inadvertently begins to rendezvous with Yamada, who comes to secretly gorge on her beloved candies and sweets. Through their interactions, Ichikawa discovers just how much of a ditz Yamada is, and cannot help but support her from the sidelines. Meanwhile, Yamada herself cannot help but tease Ichikawa relentlessly due to his flustered reactions.

With an array of heartwarming daily interactions, the distant bond between the two grows into something more than just library acquaintances. Perhaps, in time, Ichikawa will come to realize that his murderous desires have turned into something else entirely.

Boku no Kokoro no Yabai Yatsu ranked third and ninth in the 2020 and 2021 Kono Manga ga Sugoi! for the Male Readers division, respectively. It also ranked first in the Best Web Manga category at the sixth Tsugi ni Kuru Manga Awards in 2020. The manga was nominated for the 13th Manga Taisho Award and placed 11th in the final ranking. The series has been published in English as The Dangers in My Heart by Seven Seas Entertainment since July 20, 2021.