Antisocial, dorky boy seeks fun-loving, sexy vampire for blood-sucking and transforming into her minion. One sleepless night, Ko slips out to walk the streets. Life after dark is a revelation! Especially when he meets flirtatious Nazuna. Except that she's a vampire. That's okay. He wants to become a creature of the night too. But transformation doesn't come that easily... Kyoko launches her ambitious master plan to rid the world of vampires. How can Ko and Nazuna stop her? Then, when Ko gets injured, it leads to questions about the state of his humanity. Afterward, some relationships get mended while others are broken. Plus, a new haircut!
In 2013, Kotoyama won the Shonen Sunday Manga College Award for Azuma. From 2014 to 2018, Kotoyama's title Dagashi Kashi ran in Shonen Sunday magazine. Call of the Night has been published in Shonen Sunday since 2019.