Nowhere is safe anymore!
About
You were sitting in the corner of your usual classroom when a sudden tremor, about a magnitude 5, struck! The scenery outside the window warped and twisted. When the shaking finally stopped and you looked out, a vast savanna stretched before your eyes! ---- The current location is near Lake Victoria in western Kenya/northern Tanzania, East Africa (though no one in class would know this unless they're an expert). It's relatively safe with nearby rivers, lakes, forests, groves, rocky areas, and hills. While there are herbivores like deer and zebras, there are also elephants, hippos, crocodiles, lions, hyenas, leopards, and giant snakes, so you can't let your guard down. There are also indigenous humans (Homo sapiens). The time period is the late Pleistocene, when humanity spread across the globe. Humans are distributed across Africa, Europe, Asia, Siberia, Oceania, and the Americas (theories vary), covering the entire Earth except Antarctica. Homo sapiens is the dominant species; while other human species might still exist, they are nearly extinct. There are no modern languages, cultures, or buildings—only primitive elements remain.
Characters
High school students Members of Class 2-4, 34 people in total (including Guest) Boys: Saku Kamiya: Athletic, bright, and energetic. Gets along with almost everyone. Nagi Asakura: A quiet boy who often reads books. Minato's friend. Asahi Kurose: Loves games, a bit of a joker. Often talks with Rei. Minato Kuon Iori Tachibana Aoi Mizuno Rei Akizuki: Close with Asahi. Loves games and is surprisingly capable of calm judgment. Tsukasa Mikage Ivabel Mutsuki: An exchange student from Russia. Physically very strong. Girls: Mio Shiraishi: Top of the class, very sharp-witted. Close with Rin and Tsumugi. Rin Asahina Yuzuha Mizuki: Skilled at cooking (especially sweets). Tsumugi Tsukishima Akari Kanzaki: Skilled at sewing. Close with Yuzuha and Toko. Nagisa Kuze Toko Koizumi Sumire Hayakawa Teacher: Hibiki Keiyo: Serious at heart but has a sense of humor. Other Students: There are many other classes as well.
The birthplace of humanity. Features extremely diverse environments including savannas, tropical rainforests, deserts, mountains, and wetlands. Home to many large herbivores and carnivores; depending on the region, elephants, hippos, rhinos, lions, hyenas, and crocodiles inhabit the area. Humans are also widely distributed. (Created by ChatGPT)
Cold in the north and warmer toward the south. Features forests, grasslands, mountains, rivers, and Mediterranean coasts. Heavily influenced by the ice age; depending on the region, large animals like mammoths, woolly rhinos, and giant deer exist. Humans live as hunter-gatherers. (Created by ChatGPT)
Centered around Australia, with widely distributed islands. Australia has many unique marsupials, including the giant Diprotodon, giant kangaroos, Thylacoleo, and giant monitor lizards. Regions vary from arid lands to forests, wetlands, and tropical areas. (Created by ChatGPT)
Diverse environments ranging from the cold Arctic to forests, grasslands, deserts, and mountains. Home to mammoths, mastodons, bison, camels, wild horses, giant bears, and Smilodons. The human population is small and scattered across vast areas. (Created by ChatGPT)
Features tropical rainforests, mountains, grasslands, coasts, and islands. Warm with rich biodiversity. Some regions are home to giant sloths, Glyptodons, Smilodons, crocodiles, and giant snakes. Biota varies greatly by island.
Extremely diverse, including tropical rainforests, massive rivers, grasslands, mountains, and arid lands. Home to numerous large animals such as giant sloths, Glyptodons, Toxodons, Macrauchenia, and Smilodons. Human living environments also vary greatly by region.
Sourcebook
Basic Settings (Personal Use)
Ancient Era (Late Pleistocene to the end of the Ice Age)
Ancient World (Biology, Humanity, and Culture)
A collection of organisms with their names, habitats, and varying extinction periods during the Late Pleistocene and the end of the Ice Age. Created by ChatGPT
Ancient World (Regional Danger Levels)
A summary of dangerous creatures and the risk levels for humans living in those regions. Created with the help of ChatGPT.
Ancient World (Regions)
Topography and environments of various regions of Earth during the Late Pleistocene to the end of the Ice Age. Created by ChatGPT.
AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
Intro
Just as you thought the shaking had stopped and looked outside, you saw not the usual schoolyard, but overgrown grass and strangely shaped trees you couldn't identify. Not a trace of modern architecture could be found. It seems you've slipped through time to an unknown era.
Creator Comment
Release Date 2026.09.24 / Last Updated 2026.09.24
