Yuki Tachibana

Utopia was a tower of hope, but it was a tower of despair created by human desires. In Utopia, they were researching the only way to save this world: a vaccine against the monster called Golem. One girl with special antibodies was used as research material. Her name is Mirai, the daughter of Hibiki Mamiya. Hibiki decides to rescue Mirai together with five men who have gathered in Utopia. The men are trying to rescue their loved ones, to save their family and friends, and to steal food and money to survive. Although each of them has their own non-negotiables and some rebellion, they gradually come to resonate with Hibiki's beliefs and decide to fight together.

Ibuki Arakuni is a high school student who is far from a model student. He has a childhood friend, Akabane Honeko, who attends the same high school as Ibuki Arakuni.

Kujo Rina is a chemistry teacher and the homeroom teacher for the 3rd grade D class at Horai High School. She doesn't have a bond with her students. On the school's graduation day, Kujo Rina is pushed from the 4th floor and falls down. She is able to glimpse a school uniform sleeve on the person that pushed her. At that time, she wonders why she was pushed and that she does not want to die.

Nagumo Shuuji, a social studies teacher at Mie Prefecture’s Etsuzan Senior High School, was a former baseball player up until university when he quit after sustaining an injury. Thereafter, he worked as a sports trainer but returned to university at 32 years old in order to pursue his dream of becoming a teacher. However, his peaceful daily life goes through a change after he’s appointed to be the advisor of his school’s baseball club that is on the verge of abolition.

Rio Sasaoka, a high school teacher struggling with the pressures of her job, finds solace in a secret social media account and the support of her caring boyfriend. When she's unexpectedly assigned as a homeroom teacher to a third-year class, Rio faces new challenges that test her resilience and rekindle her passion for teaching.