Black: The Story of Monster Syndrome

Today, somewhere in the city, a ghost is doing people wrong. Despite such a night, two exorcists are exhaustedly having an easygoing conversation.

The titanic bipedal robot HOPE protects humanity, and Haguro Hiro longs to be the hero who pilots it. When his dreams are crushed, he clings to HOPE by working in a dismal factory where its most trivial parts are made. Stress, oppression, and delusion take their toll, with monstrous consequences.

Chapter 1 of Shounen Jump+ 10-shuunen Kinen Manga Yomikirishuu "Hen".

Chapter 3 of Shounen Jump+ 10-shuunen Kinen Manga Yomikirishuu "Hen".

A single human Earthling arrives on an isolated planet inhabited by beastkin known as "Kemo," who are shaken to their cores at the sight of their first "Hito." Thus does their society begin to transform, spurred on by this interspecies exchange…

(Source: MANGA Plus) 

 *Note: Originally published as a one-shot, was then picked up for serialization.*