Download 古今東西ダービー Demo

About This Game

Note: The game is currently available in Japanese only (text, voice, and categories).

Kokontozai! Today's Category Is...?

Kokontozai Derby is a party game that mixes horse racing with Kokontozai, the classic Japanese game where everyone takes turns naming things that fit a category.

Give your racehorse a name that fits the category, then send it out to race.

If the category is "sushi toppings," will your runner be Tuna, Salmon, or the connoisseur's pick, Engawa?

The Name Makes the Horse

Speed, Stamina, Power, Guts, and Wit. Running style (Front Runner, Pace Chaser, Late Surger, or End Closer), distance aptitude, even coat color. Everything is decided by the name you give it, and the same name always makes the same horse.

Find a name that fits the category and wins!

Live Commentary That Calls Your Horse by Name

Races play out automatically as a 3D simulation, with synthesized-voice commentary (in Japanese) that reads the names you chose out loud.

Switch between multiple camera angles at any time and see how it ends: a wire-to-wire escape, a charge down the far outside, or a head-to-head duel all the way down the stretch.

Can't wait for the result? Skip ahead to the drama of the final turn.

Place Your Bets, Strike It Rich

Buy betting tickets from the race card before the off, starting at ¥100 a ticket.

Back your own horse, or jump ship to someone else's that looks like a winner.

If your horse wins, you also collect the owner's prize, so don't worry about blowing your whole bankroll!

All money is in-game currency only. It can't be bought with real money or cashed out.

Clothes Make the Horse!

Spend your winnings on a gacha to collect horse skins. From real tack like ear bonnets and leg bandages to crowns, UFOs, jet boosters, and even dragon wings, mix and match over 200 items by body part and make your horse impossible to miss!

Horse skins have no effect on race results.

Solo or Up to 8 Players

Up to 8 players meet online, each bringing up to 4 horses into the same race.

"Wait, does that name even fit the category?" Call a vote. If the majority agrees, that horse is scratched.

In solo play, you can enter several horses of your own.

Features

• 289 categories (food, animals, places, characters, and more). The host can also set any category they like

• 3 distances (1200m / 1600m / 2400m), 3 weather types, and 4 track conditions. Change the conditions, and the "strong names" change too

• The host can freely set race conditions, field size, and the time limit for each phase

• Each race takes just a few minutes, so it's quick to play again and again

About the Voice Synthesis

The race commentary in this game is generated with the text-to-speech software VOICEVOX.

• VOICEVOX:玄野武宏(VirVox Project)

• VOICEVOX:四国めたん(SSS合同会社)

VOICEVOX / VOICEVOX CORE: ヒホ(Hiroshiba Kazuyuki)

Streaming & Video Policy

Anyone, whether an individual or a company, may stream or make videos of Kokontozai Derby (full game and demo) without contacting us first. Monetization on YouTube, Twitch, Niconico, TikTok, and other platforms (ads, memberships, tips) is fine. You're also free to use gameplay footage in clips, Shorts, and thumbnails. We will never file copyright claims.

The commentary reads out horse names exactly as players type them. In line with the voice library terms, please do not publish videos or streams where it reads out any of the following:

• Content that goes against public order or morals, or attacks specific individuals or groups

• Content tied to political or religious activities, or that calls for support of specific individuals or groups

• Intentionally false or misleading information

• Content that seriously damages the image of the characters or voice providers

We'd be thrilled if you tag your posts with #古今東西ダービー or include the store page URL in your description!

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

This game uses generative AI in the following four areas:
[Music] The in-game music was created with generative AI (Suno), then selected and edited by the developer.
[Race commentary voice] The commentary audio is generated at runtime with the VOICEVOX speech synthesis engine. Every line it reads was written by the developer, and no AI writes any of the text. The only variable part is the horse names entered by players.
[Game icon] The game icon was created with generative AI (Claude Code) and adjusted by the developer.
[Horse skins] Some 3D accessory models were built with procedural generation scripts (Blender/GDScript) written by an AI assistant, then reviewed and adjusted by the developer. No image-generation AI was used.
No generative AI was used for any other graphics, 3D models, sound effects, or fonts.

Mature Content Description

The developers describe the content like this:

The game includes a simulated gambling element: players bet in-game currency on horse races and receive payouts when their bets win. The in-game currency can only be earned through play and cannot be bought with real money or exchanged for it.
The same in-game currency can be spent on a gacha that randomly awards cosmetic items that change a horse's appearance. There are no real-money purchases.
In online play, horse names and categories freely entered by players are shown to other players.
There is no sexual content, violence, blood, or depiction of self-harm.