O Sistema Kizuna é um sistema incompleto para a implementação da paz mundial que conecta pessoas através das dores. Todos que foram conectados a esse sistema são chamados de Kiznaivers. Certo dia, Sonosaki Noriko diz a seu colega de classe Agata Katsuhira que ele havia sido selecionado para ser um Kiznaiver. O Sistema Kizuna permite que Katsuhira compartilhe seus ferimentos e se conecte aos colegas de classe cujas vidas e personalidades são totalmente diferentes da dele. A Cidade de Sugomori foi construída em terreno recuperado, mas com o passar dos anos, a população da cidade está caindo. A história se passa nesta cidade, onde Katsuhira e seus amigos vivem.
Koutaro NishiyamaYoshiharu Hisomu (voice)
Rina SatoHonoka Maki (voice)
Misaki KunoNiko Niiyama (voice)
Hibiku YamamuraNoriko Sonozaki (voice)
Yuka TerasakiChidori Takashiro (voice)
Tomoaki MaenoHajime Tenga (voice)
Nobunaga ShimazakiTsuguhito Yuta (voice)
1 - Sometimes, a Bond Can Bloom from the First Day Eye Contact Is Made
Agata Katsuhira is a strange young man who doesn't feel pain. One day, he encounters a mysterious young woman named Sonozaki Noriko, who changes his life, as well as the lives of his classmates forever.
2 - If You Can Swallow a Bizarre Situation Like This So Easily, Two Buckets of Barium Shouldn't Be a Problem
The kids are forced into doing self introductions... However, it appears that the self introductions that Sonozaki wants them to do requires much more than the usual name and what class they're in. They find out that every wrong answer has a penalty, and painfully learn that they are indeed connected to each other...
3 - Depending on How You Look At It, I Think We Could Get Through Anything... Right?
The kids find out that there's actually one other Kiznaiver, and they go to find this mysterious figure.
4 - Now That We're All Connected, Let's All Get to Know Each Other Better, 'Kay?
The kids get to know Hisomu and Sonozaki promises to let them know a secret about Kiznaivers if they agree to go to a summer training camp.
5 - Wahoo! It's a Training Camp! Let's Step in Deer Poop and Have Pillow Fights! Go! Go!
The Kiznaivers get to their training camp and are faced with the summer favorite, the test of bravery. Meanwhile, Chidori runs off on her own and the others realize that they might be connected by other means than just their pain.
6 - Nothing Good Comes From Being Around All Of You
Something from Honoka's past comes back to haunt her, and Nico makes another attempt at becoming her friend.
7 - A Battle Touching Upon the Identity of the Pain that's Seven Times the Pain of One-Seventh of a Pain
The Kiznaivers find out the truth about Maki's past, and try to help her overcome it.
8 - Happy Times Don't Tend to Last Very Long
The Kiznaivers get stuck in a building during a typhoon and some hidden feelings start to come to light.
9 - It's All Over......I Think
The Kiznaivers start to hear each others thoughts, which makes things even more complicated. Meanwhile, a secret about Sonozaki and Katsuhira is revealed.
10 - You Knew Very Well That Your Romantic Feelings Might Be Unrequited, Right?
The Kiznaivers all go their own ways. Meanwhile, Katsuhira finds out the truth about the Kizna Experiment and about Sonozaki's past.
11 - We Have To Contact Each Other And Confirm Our Feelings. Because We're Friends!
Katsuhira finds out what happened to the friends from his childhood and Sonozaki is intent on making the Kizna Experiment successful no matter what.
12 - If The Kizna System Spread Throughout The World
Noriko attempts suicide by jumping off a bridge while black Gomorin share her pain with the entire city, in an effort to unite its citizens.