Every ticket wins · No replacement
Free Ichiban Kuji Simulator Online
Set up tiered prizes from A to Last One, then draw tickets one at a time — no duplicates, no replacement, just like the real shop experience.
Prize Tiers
Add at least 1 prize to draw
What Is an Ichiban Kuji Simulator?
An ichiban kuji simulator is an online tool that recreates the famous Japanese lottery style known as 一番くじ, where every ticket you buy reveals a prize drawn without replacement from a fixed tier pool. Originating in Japan and popularized through anime, manga, and character goods stores like Lawson and 7-Eleven, real ichiban kuji boxes contain a set number of tier A, B, C, D, E, and Last One prizes — once a prize is drawn, it is gone for the rest of the box. Our ichiban kuji simulator mirrors that exact mechanic in your browser: define how many of each tier exist, then draw ticket by ticket until the pool is empty. It is ideal for fans who want to feel the thrill of working through a kuji without traveling to a convenience store in Tokyo, and for creators planning prize distributions that mimic the Japanese lottery format.
How to Use the Ichiban Kuji Simulator
The ichiban kuji simulator takes three short steps:
Build your prize list. Each row represents one tier (A, B, C, D, E, or Last) with a prize name and a quantity. Add rows with + Add Tier up to 20 total, and set quantity between 1 and 99 per tier. The default box mirrors a typical anime kuji: 1 grand prize, 2 premium items, 5 keychains, 10 stickers, and 20 postcards.
Draw tickets. Click Draw Ticket to pull one ticket at a time. The simulator uniformly selects from every remaining ticket in the box — so a tier with 20 stickers is 20 times more likely than a single grand prize. The drawn card scales in with its tier color, and the remaining-per-tier counter updates instantly.
Continue until empty. When every prize has been drawn the Draw button is replaced by a Reset Pool button, restoring all tickets for a fresh box. Share the URL to give friends or viewers the exact same setup, and check the history panel for the last ten draws.
Why Use Our Ichiban Kuji Simulator
Our ichiban kuji simulator runs entirely in your browser with cryptographically secure randomness, so the odds you configure are the odds you get — no server logging, no hidden pity curve. Unlike a weighted-draw tool, this simulator models a finite box: each draw physically removes a ticket from the pool, which is the behavior real ichiban kuji players expect. The tier-colored cards (gold, silver, bronze, teal, gray, and red for Last One) give every reveal its own flavor, and the remaining counter lets you plan strategy just like a real shop run. Pair it with our Gacha Simulator when you want infinite weighted pulls, or our Slot Machine Simulator for reel-matching luck. Together they cover the full range of prize-draw formats you are likely to need for streams, classrooms, events, and TTRPG loot.
Uses
Use Cases
An ichiban kuji simulator shines whenever you need a closed prize pool that empties ticket by ticket.
- •Simulate anime and manga merchandise kuji runs before spending real money at a Japanese convenience store.
- •Plan event prize distribution where each attendee draws once and prizes must not repeat until the box is reset.
- •Design giveaway structures with guaranteed prize counts per tier instead of pure weighted odds.
- •Generate tabletop game loot tables for a finite treasure chest that parties empty over multiple sessions.
- •Run classroom reward systems where students draw tickets for stickers, postcards, or bigger surprises.
Know-how
Tips & Best Practices
A few tips will make your ichiban kuji simulator sessions feel authentic and fair:
• Balance your tiers like a real box. Japanese kuji boxes almost always follow a pyramid — 1 or 2 A prizes, a few B, more C, and a large pile of D and E so the box lasts 50 to 80 tickets.
• Reserve the Last tier for one ticket only. In real ichiban kuji, the Last One bonus prize goes to the final ticket drawn from the box — it is a single, special reward, so setting Last quantity to 1 keeps that flavor.
• Use descriptive prize names. "Chibi Figure — Variant A" reveals more dramatically than "Prize 1", especially with the tier-colored card backing it.
• Reset Pool between runs. It restores every drawn ticket without wiping your tier configuration, which is perfect for rerunning the same box for a new viewer, student, or friend.
• Share your URL. The link encodes every tier, name, and quantity, so your viewers or classmates see the exact box you set up.
Questions
Frequently Asked Questions
What is ichiban kuji?
Ichiban kuji (一番くじ) is a Japanese lottery style where every ticket wins a prize from a fixed tier pool, most commonly A through E with a special Last One bonus for the final ticket drawn from the box. It is hugely popular in Japan through Bandai Spirits, with boxes themed around anime, manga, games, and characters sold at Lawson and 7-Eleven. Unlike gacha, prizes are drawn without replacement — so the odds shift with every ticket pulled.
Is this free to use?
Yes — the ichiban kuji simulator is completely free, with no account, no sign-up, and no hidden purchases. Configure unlimited tiers, draw as many boxes as you want, and share your setups with anyone. Everything runs locally in your browser, so there are no server costs and no wallet needed. Treat it like a fresh Japanese kuji box that never runs out as long as you keep clicking Reset Pool.
Is the draw fair and random?
Yes. Every draw uses crypto.getRandomValues, the Web Crypto API's cryptographically secure random number generator, to pick a uniformly distributed ticket from the remaining pool. That means no Math.random weakness, no seed predictability, and no hidden bias. A tier with 20 tickets is exactly 20 times more likely than a tier with 1 ticket, and the drawn ticket is immediately removed so the remaining odds rebalance correctly for the next pull.
Can I customize tiers and prizes?
Absolutely. The editor supports 1 to 20 tier rows, each with one of six tier labels (A, B, C, D, E, or Last), a free-form prize name, and a quantity between 1 and 99. Add rows with + Add Tier and remove them with the × button. Your configuration saves in localStorage so it survives page reloads, and Copy Share Link produces a URL that rebuilds the entire box on any device.
What happens when all prizes are drawn?
When every ticket has been drawn from the box, the Draw Ticket button disappears and a Reset Pool button takes its place along with an "All prizes have been drawn" message. Clicking Reset Pool restores every ticket in your configuration so you can run the box from scratch — your tier setup, quantities, and names remain exactly as you had them. Draw history is preserved separately and can be cleared independently.
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