The premise
Koivisto is a Karelian village of thirty-eight souls on the shore of Lake Vakka, in February of 1912. The lake has not frozen. It should have frozen in November. It is now the fourteenth of February, the air is minus thirty, and the lake is still liquid, still steaming.
The pastor died on the twenty-third of January. His widow knows why. His replacement has not left the parsonage since the day he arrived. The villagers do not say his name aloud. The Rautio store is open. The cooperative still meets. The men of the upper river still come down for salt and tobacco. None of it is normal anymore, but Koivisto goes on doing what Koivisto has always done, because the alternative is unthinkable.
You arrive into a village that is keeping a secret from itself. Aino Virtanen will tell you nothing the first time you ask. The Yläjoki loggers stopped coming down a week ago and nobody has gone to check. Tobias Lindqvist's daughter sleepwalks now. The lake at dusk makes a sound that resembles a hymn one note out of true.
This is a horror sandbox. You can leave on the Sortavala Road. The road is a long walk in winter. The lake is closer.
What this world plays like
Your first ten turns introduce you to the village by name. The pastor's widow weighs you. The Rautio store treats you as a customer until they decide whether to treat you as something else. You may sit in the church. You may walk the shore. The lake does not warm under any conditions you can identify, and the village's quiet refusal to discuss this is the first thing you notice.
By turn fifty, you have a bedroom somewhere and a place at someone's table. You have heard one story you wish you hadn't. The replacement pastor has spoken to you, or refused to. The Yläjoki loggers' camp is silent. The lake has crept inland by a measurable distance, which is impossible.
By turn one hundred, the village is dividing along lines that did not exist when you arrived. The Väen Voima are arming. The church faction prays differently than they did a week ago. The Järven Kansa have stopped coming to market. Whatever is happening to Koivisto is now happening to you, and the world remembers each choice you have made, including the ones you regret.
Koivisto does not reset between sessions. Close the tab on Tuesday. The lake does not freeze.
Factions in motion
Väen Voima (The People's Strength)
An informal but powerful coalition centered on the Virtanen family, dedicated to preserving the old Karelian traditions and social order. They believe the unfrozen lake is a sign of imbalance that can only be corrected by the 'practice', a pre-Christian sacrificial rite. Their goal is to ensure the rite is performed to save Koivisto from starvation, regardless of the moral or religious cost.
Koiviston Kirkko (The Church of Koivisto)
The official religious authority of the village, representing the Evangelical Lutheran state church. Led by the new, outsider pastor, this faction seeks to impose a strict, scripture-based faith and eradicate the local syncretic traditions which it views as pagan heresy. They interpret the village's hardship as a divine punishment for its apostasy.
Rautio Kauppa (The Rautio Store)
The economic heart of Koivisto, run by the pragmatic Henrik Rautio, who controls the only flow of goods and information from the outside world. This faction is driven by profit and the maintenance of its monopoly, not by faith or tradition. Their primary goal is to see stability returned, as a starving village cannot produce the surpluses needed for trade.
Yläjoen Miehet (The Men of the Upper River)
A loose-knit group of younger men, primarily loggers, who reject the old superstitions that govern village life. They represent a more modern, rationalist worldview and believe the 'practice' is nothing more than ritual murder. They seek a practical solution to the famine, looking to organized hunting or an appeal to the authorities in Sortavala rather than appeasing a lake spirit.
Järven Kansa (The People of the Lake)
The destitute families, led by the Korhonens, whose entire livelihood was destroyed when the lake failed to freeze. Utterly desperate, they are driven by the singular goal of survival. They are a volatile and unaligned group, easily swayed by promises of food or a swift return to normalcy, making them a key political pawn in the conflict between the other factions.
People you'll meet
Aino Virtanen
Tobias Lindqvist
Henrik Rautio
Väinö Laakso
Kalle Nieminen
Ilmari Korhonen
Places that matter
Koivisto Village
A line of eight red-painted log houses and a central store, set back from the lake and huddled against the encroaching forest. Woodsmoke hangs heavy in the frigid air, the only sign of the thirty-eight souls weathering the unnatural winter within.
Lake Vakka Shore
A shoreline of dark, smooth stones, unnaturally warm to the touch. The lake itself is a black, liquid mirror, perpetually steaming into the minus-thirty-degree air. The column of steam is visible for kilometers, a slow, constant exhalation.
St. Mikael's Ridge
A low ridge overlooking the village and the lake, crowned by the white wooden church and the dark, two-story parsonage. The wind is sharper here, and the view of the lake's steaming expanse is total and unnerving.
The Sortavala Road
A narrow track cut through forty kilometers of dense, snow-laden taiga forest, barely wide enough for a single sleigh. The trees press in close, their branches heavy with snow, muffling all sound. To be caught here at night is a death sentence.
Yläjoki Logging Camps
A collection of crude timber barracks deep in the forest upstream from Koivisto, populated by transient lumberjacks. The air smells of pine resin, sweat, and cheap tobacco. It is a place of hard labor, hard drinking, and rough men.
A real turn from this world
Aino sets the kettle down without looking at you. The kitchen is small enough that you can hear her breathing.
"My husband," she says, "wrote a letter on the twenty-second."
She does not say the twenty-third. She does not say what happened on the twenty-third.
The letter is on the table between you, folded twice, the wax broken. She has not opened it again since the funeral. She has not given it to the new pastor. She is giving it to you because you asked the right thing, or because she has decided you are who he meant.
You take the letter. You do not read it yet. The world records that you carry it. Aino's trust shifts +2. Standing with the church faction shifts -1. The replacement pastor, who watches the village from his window, will have noticed.
Why Koivisto - The Lake Unfrozen holds up over a long campaign
Most AI roleplay tools are built around a single session. They start to fall apart at hour ten and are barely playable at hour fifty. Koivisto - The Lake Unfrozen doesn't, because the world isn't living in a chat history - it's living in a database.
Mechanical truth in Postgres. Coins, inventory, NPCs, factions, locations, properties - all in real database rows. The narrator describes around the database; the database is what's true. By turn 500, your business ledger still balances and your apprentices still have the names you gave them.
Hierarchical chapter compression. Every chapter compresses into a tight summary; summaries compress into act-level summaries. The hundredth turn can pull a relevant detail from chapter two without flooding the context window.
Semantic memory. Important moments are embedded as vectors. When the current scene references an old promise, the engine retrieves the exact exchange where that promise was made - even 800 turns ago.
You'll be asked to choose Quick Start or build a character of your own.