Kiznaiver (manga)

A tie-in manga by Roji Karegishi that was published simultaneously by Crunchyroll digitally and by Kadokawa Shoten in their Dengeki Maoh magazine. It premiered on March 25, 2016.

Plot
Katsuhira Agata is a quiet and reserved teenage boy whose sense of pain has all but vanished. His friend, Chidori Takashiro, can only faintly remember the days before Katsuhira had undergone this profound change. Now, his muffled and complacent demeanor make Katsuhira a constant target for bullies, who exploit him for egregious sums of money. But their fists only just manage to make him blink, as even emotions are far from his grasp.

However, one day Katsuhira, Chidori, and four other teenagers are abducted and forced to join the Kizuna System as official "Kiznaivers." Those taking part are connected through pain: if one member is injured, the others will feel an equal amount of agony. These individuals must become the lab rats and scapegoats of an incomplete system designed with world peace in mind. With their fates literally intertwined, the Kiznaivers must expose their true selves to each other, or risk failing much more than just the Kizuna System.

Manga Guide
The Kiznaiver manga spans over 8 chapters, with a preface chapter (Chapter 0) to introduce the series to any new readers. The manga was written and released after the anime by Crunchyroll and Kadokawa Shoten. There are no substantial differences in content between the manga and anime. The extent of changes you might notice are minor variations every so often.

Unfortunately, the manga is not currently available in printed or physical form in the English language. For anyone interested in reading it otherwise, it may be found on Crunchyroll's manga store as they are one of the original sponsors and publishers of the series.