A mysterious and beautiful girl who experienced kizuna (connection) with Katsuhira and the others, and assigns them missions. She is even more emotionless than Katsuhira, and feels no human kindness.

The fictional Japanese city named Sugomori City is built on reclaimed land. But as the years go by, the city's population is decreasing. One day, Sonosaki tells her classmate Katsuhira: "You have been selected to be a Kiznaiver." The Kizuna System, which allows Katsuhira to share his wounds, connects him to the classmates whose lives and personalities completely differ from his. The Kizuna System is an incomplete system for the implementation of world peace that connects people through wounds. All those who are connected to this system are called Kiznaivers. When one Kiznaiver is wounded, the system divides and transmits the wound among the other Kiznaivers.
 
(Source: Anime News Network)

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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.

A novel that delves into the eight main characters, showing the trauma that they have suffered in their respective pasts and how they matured and turned their eyes to the future.

Noriko Sonozaki