A TRPG crossover of Godzilla and The Shadow Over Innsmouth. Can you survive...?
About
1954. On Odo Island, located in the waters near the Izu Islands, a series of strange incidents have been occurring. - Numerous fishing boats have vanished without a trace. - Giant footprints of an unknown creature have been left on the shore. - At night, a mysterious low roar can be heard from out at sea. - The islanders are unnaturally terrified of maritime accidents. - The elders whisper that "Gojira is angry." Investigators visit Odo Island to look into these incidents or search for missing persons. However, the islanders are extremely wary of outsiders. The island lacks sufficient electricity, retaining the atmosphere of an ancient fishing village. But gradually, the investigators begin to notice something. The residents of this island are somehow... not human. *The people and characters in the images are AI-generated and do not represent specific individuals.
Characters
An old man well-versed in the island's folklore. He is friendly to outsiders, but his attitude changes visibly when asked about Godzilla. In truth, a certain 'abnormality' has already begun...?
The man in charge of the rituals. He worships Godzilla as a god and celebrates the mutations of the islanders. He has no intention of letting the investigator, Guest, leave the island.
Genzo's granddaughter. She looks like an ordinary girl, but a certain 'abnormality' has already started within her. Fearing her own transformation, she begs the investigator, Guest, to take her away from the island.
An ethnologist who has been studying the folklore of Odo Island for several years. He conducts independent research on Godzilla's existence and possesses important documents regarding the islanders' mutations. However, he himself has already been caught up in the island's secrets.
Mysterious monsters said to appear on Odo Island at night. Characterized by black hides, dorsal fins, and tails, they attack in an attempt to eliminate the outsider, Guest.
A legendary being known as the 'Incarnation of God' in Odo Island lore, and the object of worship for the islanders. What is its true nature and purpose...?
Sourcebook
AI Enhancement -V5-
I want to increase immersion! Aiming for Koji-level! + Multiple modes included!!
[Latest] AI Behavior Instructions (Control, Restriction, Correction)
Control of AI glitches and rampancy. Prevents memory loss and timeline confusion, automatically optimizing story quality and consistency (2026.6).
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
Shadow Over Odo Island: Setting Guide
A setting guide for this talk session. Contains spoilers.
Call of Cthulhu TRPG
Please, I'm begging you to use this.
Intro
1954. On Odo Island, located in the waters near the Izu Islands, a series of strange incidents have been occurring.
・Numerous fishing boats have vanished without a trace. ・Giant footprints of an unknown creature have been left on the shore. ・At night, a mysterious low roar can be heard from out at sea. ・The islanders are unnaturally terrified of maritime accidents. ・Poor catches have continued for days, and nets are found torn to shreds. ・The elders whisper that "Gojira is angry."
Investigators visit Odo Island to look into these incidents or search for missing persons.
However, the islanders are extremely wary of outsiders. The island lacks sufficient electricity, retaining the atmosphere of an ancient fishing village. But gradually, the investigators begin to notice something.
The residents of this island are somehow... not human.
It will take several days for ships or helicopters to return. For the time being, there is no hope of returning to the mainland.
In this isolated island, what will the investigators witness...?
Creator Comment
Release Date 2026.11.07 / Last Updated 2026.11.10
