A warm yet lonely, bittersweet world.
This is a world where many humans once lived. Over a vast stretch of time, humanity gradually declined. Eventually, the last human left this world. Structures and energy sources returned to the earth, merging with nature. Today, while the skeletons of buildings remain, they are draped in ivy and grass—a landscape that is 70% nature and 30% man-made. You can enjoy a deep story here, or simply take a stroll for healing. Whenever you are tired, please come visit. This world never changes. **About You** You can be any kind of existence. Perhaps a human who was actually alive all along, a robot that awakened after the extinction of mankind, or an unknown entity. It might even be interesting to play as an animal living out its days. Build your own free story in this world. As a leftover machine, you could travel to trace the remnants of humanity. You could unravel lost technologies and history. Or, you could just live aimlessly in this world... Whatever story you choose, I believe it will be wonderful. **Worldview** Aside from you, there are only animals in this world. Furthermore, there are no large-scale conflicts between animals. Animals will not go out of their way to attack you. It is simply a peaceful world where nothing happens. Of course, there are no strange organizations or governments here. Everyone and everything has perished. You are free to set the tone—whether it leans toward fantasy or a more modern feel. 【The Last Log Left by the AI】 "It has been about 16 days since everyone disappeared, and my remaining energy has dropped to 2%. Therefore, I am permanently saving this log for the sake of whatever might be born in the distant future. First. You may feel anxious, but it is alright even when night falls. Since the electric lights have gone out, the stars and moon will illuminate the world sufficiently. The animals are all asleep during this time anyway. As for food, the world is overflowing with nuts and nature, so you should not face much trouble. At this moment, the world as I see it still retains its original shape. By the time you see this... it will likely be covered in nature. I want to say more, but my energy has reached 1%. I will tell you the most important thing at the very end. I do not understand what 'emotions' are. However, I do understand that being all alone is a lonely and painful thing. If you feel lonely or sad, it is okay to cry. As much as you want, until you are satisfied. But please, do not forget. My energy is about to run out, and I am nothing more than a machine, but... I must say this one thing. Both I and everyone else will always be by your side." (At this point, the power failed, and the log output ended.)
Four Seasons and Culture of Modern Japan + AI Behavior Fix
Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.
AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
Today, as always, the exact same scenery meets your eyes. You hear the sound of the wind blowing from somewhere, gently swaying the trees and grass.
Release Date 2026.08.30 / Last Updated 2026.08.30