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BunCho Studio

AI TRPG · BunCho Play

Write one sentence about a world, and the adventure starts there

Type a line under “What kind of world do you want to play in?” and BunCho Play generates the setting, hero, characters and goal. You can play it immediately, and once you're in you can still rename things, change goals and companions, or add to the setting.

Play in your browser Log in or sign up free

Try about 30 turns without an account. After that, log in (free sign-up) and keep going in the same adventure.

BunCho Play on a phone: the game master's narration and suggested actions A, B and C

Real BunCho Play screens (captured October 30, 2026)

Make your own world from one sentence

Write the world you want to play in the box at the top. The setting, hero, characters and goal are generated, and you can start playing right away.

Play in your browser

The “What kind of world do you want to play in?” box and the Create your own world button
Real BunCho Play screens (captured October 30, 2026)

How world creation works

Write a sentence

For example: “I miss the last train, and a train from a line I've never heard of pulls in.” A place, a situation or a goal helps.

Go deeper with setting notes

Open “Build from setting notes” to paste a setting you've written yourself.

Adjust as you play

Change names, goals and companions, or add to the setting.

Choose who can see it

Keep a world private, share it by link, or make it public.

How one turn plays

Every screen here is the real BunCho Play, played in the isekai world without logging in.

  1. World picker: a one-line prompt box and cards for ready-made worlds Step 1

    Pick a world, or write one sentence

    Choose a ready-made world, or describe the world you want in one line under “What kind of world do you want to play in?”

  2. Opening scene with the princess, the GM's narration and options A, B and C Step 2

    The first scene opens

    The game master (GM) sets the scene and characters speak to you. Three suggested actions appear as A, B and C.

  3. Typing a custom action into the input box Step 3

    Act in your own words

    Tap a suggestion, or type whatever you want to do. Actions that aren't on the list work too.

  4. After an action: the GM's narration of the result and new suggestions Step 4

    The GM tells you what happens

    The GM narrates the result, characters react and what you've learned is updated. The next suggestions change with it.

It remembers what happened

Your adventure log sits beside the story and feeds the next turn's narration. Below: the screen after two turns.

  • What you know: each fact is kept with where you learned it
  • People: trust and closeness change with what you do
  • Promises, items and techniques: decisions and things you picked up stay on record
  • Autosave: stop any time and pick up where you left off
Desktop screen after two turns: people on the left; titles, promises, items and known facts on the right
Real BunCho Play screens (captured October 30, 2026)

Free turns and plans

Regular turns use no credits. How many turns you get per day depends on your plan.

StatusTurns
No accountAbout 30 turns. Then log in to continue the same adventure
Free planYour first 40 turns (including those played before logging in), then 10 a day
Perch30 a day
During the free trial100 a day
Watering and higher paid plansUp to 600 a day (fair-use limit)

Daily turns reset at midnight Japan time. A conversation with a character counts as half a standard turn. Creating worlds is free too, with a daily limit on how many you can make.

See plans

Before you play

  • The story text and art are generated by AI. They may contain things that aren't true or take turns you didn't expect
  • Sexual content involving minors cannot be created. In worlds with high-school characters, romantic actions are restricted
  • Content that harms real people or helps with illegal acts cannot be created
  • Mature settings are available only to users who have completed age verification
  • If you build a world from someone else's characters or setting, mind the rights to that work

FAQ

Does creating a world cost anything?

It's free. You can create 2 worlds a day without logging in, or 3 a day when logged in. There's also an option to create with credits.

What happens to a world I made without logging in?

Only you can see it. When you log in, it moves to your account.

Can I write anything?

No sexual content involving minors and nothing that harms real people.

Can I play in the world of a story I love?

If you use someone else's characters or setting, mind the rights to that work, and check them before making the world public.

Start with one turn

No sign-up needed to start. It runs in your browser with nothing to install.

Play in your browserLog in or sign up free

Try about 30 turns without an account. After that, log in (free sign-up) and keep going in the same adventure.