The introduction of 7G Network technology promised miraculous technological advancements; however, the aftermath of its launch plunged Japan into chaos. From drastic changes to the terrain to bizarre mutations among people, the way of life is overwritten with new rules. The town of Agano is one of the few remaining settlements, and its citizens aged 21 and above have transformed into animals. Shizuru Chikura, a high school student from Agano, is desperately searching for her friend, Youka Nakatomi. Coming across a picture in a newspaper placing Youka in Ikebukuro, Shizuru starts packing for a trip. But with public transportation effectively shut down, her options are limited. Fortunately, Tairo Zenjirou, a senile old conductor and the only human adult in town, comes to the rescue when he teaches her how to operate an abandoned train. With her destination set, Shizuru ventures off on a journey to find her missing friend. On the day of departure, however, her other classmates—Nadeshiko Hoshi, Reimi Kuga, and Akira Shinonome—decide to tag along at the last minute as they embark on this one-track adventure that might expose them to dangers far surpassing anything they have encountered in Agano.

When Leoleshea, a dragon god, is accidentally awoken from her sleep within a glacier, she demands this era's very best game player be brought before her. After a year of waiting, she meets Fay Theo Philus, an apostle—a human granted a supernatural ability called an Arise and thus given permission to challenge the gods in games. Fay and Leoleshea realize they share a passion for games, whether it be with cards or a battle of wits with a god. Declaring that she likes this human, Leoleshea allows Fay to call her "Leshea" and team up with her to play in the gods' games. Ever since the gods gave humans the ability to challenge them, they have promised to grant any wish after ten victories. Leshea desires to become an official god again, as she previously descended to the human world and lost her status as a divine being. Fay has only one goal: to find the woman who long ago taught him how to play games. Though Leshea and Fay quickly prove themselves to be a capable team, the gods will not allow them ten victories so easily: every game has its own unique conditions and hidden rules. Together, the duo will have to act as a perfect team to finally achieve their goals.

Third season of .

Kivotos is a federal megalopolis comprising thousands of schools and is led by the General Student Council (GSC), which acts as its governing body. Ironically, despite being an academy city, Kivotos is rife with gun violence, and all students wield firearms as part of their everyday lives. As if the crisis in Kivotos was not enough, the GSC president is nowhere to be found. Fortunately, before her sudden disappearance, the GSC president enlisted the help of Sensei—a teacher who is most likely the only one in Kivotos—to support students in their time of need. Sensei's first course of action is to assist Abydos High School, a once prestigious academy now with merely five students in attendance. These remaining students are doing everything they can to pay their academy's crippling debt of almost one billion yen.