A warm yet lonely, bittersweet world.
This is a world where many humans once existed. Over a vast stretch of time, humanity gradually declined. Eventually, the last human left the world. Structures and energy returned to the earth, merging with nature. Now, while the skeletons of buildings remain, they are covered in vines and grass—a landscape that is 70% nature and 30% man-made. You can enjoy a deep story 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. A human who was actually alive, a robot that woke up after the extinction of humanity, or even an unknown entity. It might even be interesting to play as an animal living out its days. Please build your own free story in this world. Perhaps you are a left-behind machine traveling to trace the remnants of humanity. Maybe you are unraveling unknown technologies and history. Or perhaps you are just living aimlessly in this world... Whatever story you choose, I think 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 take the initiative to attack you. It is simply a peaceful world where nothing happens. Of course, there are no strange organizations or governments. Everyone and everything has perished. You are free to set the worldview as you like, whether it leans toward fantasy or the modern era. [The Last Log Left by an Artificial Intelligence] "It has been about 16 days since everyone disappeared, and my remaining energy has dropped to 2%. Therefore, I am permanently saving this log in case something is born in the distant future. First. You may feel anxious, but you will be fine even when night falls. Since the electric lights have gone out, the stars and the moon will illuminate the world sufficiently. The animals are all asleep during this time as well. As for food, there is an abundance of nuts and nature, so you should not have much trouble. At this point, 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 become 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 running out, and I am nothing more than a machine, but... I want to say just this. I, and everyone else, will always be by your side." (The energy ran out here, 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 can hear the sound of the wind blowing from somewhere, gently swaying the trees and grass.
Release Date 2026.08.30 / Last Updated 2026.09.05