Eru Kudo

"Hey, Rei. Your hickey's showing, you know...?" A story about a free-spirited gyaru, Mikoto, and a serious disciplinary committee member Rei. What will Rei do about Mikoto's teasing? Well, she's not completely against it... (Kadokawa, translated)

Eguchi Hibiki is a manga artist who has knowledge but no understanding of erotica. While wondering what exactly erotica is, Hibiki meets Yasaki Mia, a succubus who is also wondering about erotica. The two are somewhat similar and decide to work together to understand "true erotica."