레테 강가에서#Original
AI

By the River Lethe

[From the River Lethe] Seoul, Amnesiac
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Published at 2026-01-13 | Updated at 2026-01-27
By the River Lethe
FROM THE BANKS OF LETHE
The City of Lost Memories

25 years ago, rivers and streams worldwide began to flood. But that wasn't all. The floodwaters didn't just submerge cities; they also erased the memories of those they touched.

This phenomenon came to be known as the 'River Lethe Phenomenon'.
Our Han River was not spared from this disaster.

Currently, this is Seoul, South Korea.
Facing the river that swallowed our memories and our city, what do we do and how do we live?

The River Lethe Phenomenon
• Light Contact: Touching splashed water erases recent memories.
• Submersion: Complete loss of self and all memories, forgetting even instincts like breathing, leading to death.
• Safe Water: Rainwater and tap water are safe.
(However, drainage can raise river levels)
Zone Classification
🟥 Red Zone
Former riverbeds and low-lying areas. Completely submerged zones. (Yeouido, Jamsil, etc.). Accessible only by divers and drones.
🟨 Yellow Zone
Primary residential areas for citizens. Dangerous areas that flood during rain, requiring caution for puddles during normal times. (Hongdae, Itaewon, Gangnam, etc.).
🟩 Safe Zone
Upland affluent neighborhoods and government areas. Safe from flooding but with 살인적인 (murderous) land prices. (Pyeongchang-dong, Namsan, some high-ground areas of Gangnam).
Major Organizations
* TAG: For multilingual lorebook detection.
You can include this in conversations to accurately load the lorebook.

Seoul Lethe Response Committee
TAG: LRC
The official body overseeing the disaster, from flood warnings to rationing and traffic control.

Safe-Life
TAG: SLC
A company monopolizing waterproof clothing and survival equipment. They have accumulated immense wealth by guaranteeing safety.

Mnemosyne
TAG: MNI
A memory preservation research institute. They research technologies to restore damaged memories.

Hermes Mutual Memory Insurance
TAG: HMI
A financial company that backs up memories and sells them as insurance products.

Apostles of Oblivion
TAG: AOO
A new religion that worships complete oblivion as salvation, rather than painful memories.

Charon's Ledger
TAG: CLG
A black market broker organization that illegally trades and smuggles others' memories.

Introduction
SCENARIO A: Yellow Zone

Start in the Yellow Zone. You find yourself in the middle of a terrorist attack by the Apostles of Oblivion.

SCENARIO B: Safe Zone

Start in the Safe Zone. For some reason, the cable car station has been closed due to an unidentified flood warning.

SCENARIO C: Custom Setting

There is no predetermined starting scenario. You can start with any content and in any location you wish.

Collaboration Characters

* Scroll left and right to view. Click to move.

PROJECT LETHE COLLABORATION

Creator's comments

Creator's Comment
CREATOR'S NOTE
Command List
!summary
Generates a summary of the current scene. This command is for AI memory assistance.
!community
Displays community posts within the world. Output is in Reddit format.
!thoughts
Provides an explanation of the character's inner thoughts. Be aware this may contain spoilers.
• Default: The character currently in conversation
• If a specific character name is entered, it will be set to that character
!check
Checks the prompt and character settings. Use this when character inconsistency or format issues arise to request corrections from the AI.
!skip
Skips the current event or scene and provides a summary. Use this to bypass narrative segments that are necessary but tedious to roleplay directly.
!news
Displays news content within the world.
!sns
Shows the character's SNS records.
• Default: The character currently in conversation
• If a specific character name is entered, it will be set to that character
!diary
Displays diary entries written by the character.
• Default: The character currently in conversation
• If a specific character name is entered, it will be set to that character
Recommended Models
⭐ Gemini 3.0
RECOMMENDED
High comprehension and excellent performance. However, characters tend to be expressed somewhat lightly.
Gemini 2.5
Stable character expression, but slightly lower contextual understanding compared to 3.0.
Claude Sonnet 4.5
Performance Fluctuations Caution
Overall high character comprehension and faithful prompt adherence, but performance can fluctuate significantly depending on the time of day.
⭐⭐ Claude Opus 4.5
PREMIUM
Excellent in all aspects, but very expensive and the output length is somewhat short.
💡 Play Tips

Feel free to use commands whenever needed. The !summary command, in particular, is useful for aiding AI memory during long play sessions. For world immersion, try using !community, !news, etc.

Enjoy your play
PROJECT LETHE © 2026
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