Chapter 1, Ajin Wiki

Detection and Subsequent Action is the first chapter of the manga Ajin: Demi-Human, written by Tsuina Miura and Illustrated by Gamon Sakurai. We are first introduced to Kei Nagai, a teenage boy who is talking to his friends about studying throughout summer break for medical school. Soon after he spots Kaito, referring to him as Kai in his head, hinting that they have/had some sort of relationship, but brushes him off as a "freak" as soon as his friends question whether or not Kei knows him or no

Kaito, Ajin Wiki

Which anime series have left you saying “what the hell did I just watch”? - Quora

PODCAST - Episode 57: AJIN: Demi-Human vol. 1 by Gamon Sakurai and Tsuina Miura

Death Note Manga

What anime is similar to Tokyo Ghoul? - Quora

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Read Ajin Chapter 1 - MangaFreak

Chapter 40, Ajin Wiki

Takeshi Kotobuki, Ajin Wiki

PODCAST - Episode 57: AJIN: Demi-Human vol. 1 by Gamon Sakurai and Tsuina Miura

Ajin (Ajin: Demi-Human) Manga

Read Ajin Chapter 1 : File: 01: The Discovery And The Actions That Followed on Mangakakalot