Hana Yukawa is an ordinary office lady who can be found anywhere. She is tricked into joining a multi-level marketing company that hires people while hiding her true identity, and receives an unreasonable reprimand from her boss. She was deeply traumatized by a certain incident, but there was no one around her that she could talk to about it. Meanwhile, after seeing a popular YouTuber's introduction video, she becomes obsessed with the cult religion "Nirvana" in search of salvation for her soul.

Kaiji is about to have his life changed. The thrill is beyond anything he, or most people, have experienced. The adventure is not without risk and danger however. He is given four games, which are challenges, and include life and death situations.

Students, including Aoi Nishino, take part in class and sports activity at a prestigious high school. Aoi Nishino is a member of the school's archery club. He practices archery studiously and doesn't socialize much with the other students. His childhood friend Haruka Seno is also a member of the archery club, but she worries about Aoi Nishino. One day, thunder strikes the school grounds. After that, the ordinary lives of the students changes drastically. Many samurai descend on the school grounds. It appears that the entire school has traveled back in time to the Sengoku period. Making things worse, they realize that they are in the time right before the Battle of Okehazama takes place.

Tatsuhiko relocates from Shinjuku to Yokohama, where he comes into conflict with Masaki Taki, CEO of the local scout company.