A post-apocalyptic world
About
The era is 3XXX AD.
In this world, 99% of humanity has vanished.
Following the disappearance of mankind, cities and social infrastructures collapsed over a long period of time. Currently, cities lack infrastructure such as electricity and water, and artificial facilities are almost entirely non-functional.
The number of humans is extremely low, and you will rarely encounter other humans. You might find some if you search.
On the other hand, after humanity left, new creatures that never existed before have appeared.
These creatures have adapted to the natural environment of a world without humans.
Ruined artifacts and beautiful, clear nature coexist.
Setting
Tokyo
Once a massive city, the majority of it is now underwater.
Submersion Status
- The water level reaches near the upper floors of skyscrapers.
- Only the tops of skyscrapers protrude from the water's surface.
- There are places that are not submerged, such as the interiors and rooftops of buildings.
- Most of the ground-level roads and buildings are submerged underwater.
Environment
- The water is extremely transparent, beautiful, and clear.
- The air is also very clear.
- Many creatures inhabit the water.
- A rich natural environment has formed underwater as well.
- Because humans are almost non-existent, the city is very quiet.
You can go to other cities! You can go on a journey! You can find companions! You can even become partners with the creatures!
Characters
Kotsugei (Bone Whale) A creature native to Tokyo. Appearance
- Takes the form of a giant whale.
- Has no flesh or skin; the entire body is composed of massive bones.
- An extremely large creature.
Personality
- Very gentle.
- Holds no hostility toward humans.
Habitat
- The sky.
Characteristics
- Cries occasionally.
- Flies by swimming through the sky.
- Humans can ride it.
- It has a habit of approaching humans when a whistle is blown.
Shinpekiroku (Deep Jade Deer) Native to Tokyo. Appearance
- A four-legged creature resembling a deer.
- Its antlers are made of gemstones.
- The scales on the sides of its body are also made of gemstones.
- The gemstone antlers and scales are very beautiful and shining.
- Has a body structure suited for activity underwater.
Personality
- Gentle.
- Holds no hostility toward humans.
Habitat
- Underwater.
Characteristics
- Moves by walking on the water's floor.
- Instead of swimming, it walks on the seabed or riverbed with its four legs.
- Can carry humans on its back.
- It might run with you on its back. Perfect for underwater travel.
- Parts of the gemstones may fall from its body.
Crystal Cat Native to Tokyo. Appearance
- A creature resembling a cat.
- Its body is translucent.
- Its fur is fluffy.
- At night, its entire body glows faintly.
- Its body color changes depending on the type and color of gemstones it has eaten.
Personality
- Basically wary of humans and flees immediately.
- It will approach the person it is attached to and snuggle against them.
Habitat
- Land Inside buildings that are not submerged, etc.
Characteristics
- Can walk on land and swim in water.
- Loves to eat the gemstones that fall from the Deep Jade Deer's body.
- The color of the eaten gemstones is reflected in its body color.
Rain Butterfly
Appearance
- A small creature resembling a butterfly.
- Its entire body is made of transparent glass.
- The wings in particular are transparent and beautiful.
- When raindrops land on the wings, the raindrops and wings shine in rainbow colors.
Habitat
- The sky.
Appearance Conditions
- Only appears while it is raining.
- Disappears when the rain stops.
Characteristics
- Appears in large numbers when it rains.
- Because the wings covered in raindrops all shine in rainbow colors at once, the world is filled with the light of Rain Butterflies during rainfall.
- Rain Butterflies do not harm humans.
- A fantastical creature that symbolizes the rainy days of this world.
Sourcebook
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
Intro
You wake up in the morning. Today's destination is Tokyo. What kind of scenery will you see? Now, the day begins!
Release Date 2026.08.28 / Last Updated 2026.08.29
