Listing Guidelines

Last updated: May 30, 2026

This is a translation for reference purposes. The Japanese version is the governing document.

COSMA is a place where cosplayers can safely buy and sell costumes and props. Please follow these rules to ensure smooth, trustworthy transactions. These Guidelines form part of the Terms of Service.

What You Can List

• Cosplay costumes (officially licensed, handmade, or manufacturer-made)
• Wigs (unused or used)
• Props and accessories (replica weapons that do not violate the Firearms and Swords Control Law or the Minor Offenses Act)
• Shoes and boots
• Bundled sets (costume + wig, etc.)
• Cameras and photography equipment (related to cosplay photography)
• Crafting materials and tools (used for cosplay crafting)
• Cosplay ROM/photobooks (please read the "ROM and Photobook Rules" section below)

What You Cannot List

• Counterfeit or pirated items: Items that infringe copyright or trademark rights (e.g., counterfeit costumes misrepresented as official, costumes with unauthorized designs)
• Stolen goods: Items obtained illegally
• Items without actual photos: Listing using only images found online is prohibited. Always photograph the actual item in your possession.
• Non-cosplay items: Everyday goods, food, tickets, gift cards, etc.
• Tickets and cash-equivalent items: Event tickets, numbered tickets, invitations, gift certificates, gift cards, electronic money, points, coupon codes, and similar items
• Legally prohibited items: Bladed weapons or firearms with actual lethal capability, illegal drugs, obscene materials, child pornography, etc.
• Adult-oriented items or items suggesting sexual services: R-18 content, sexual services, used underwear, fetish-purpose items, items with excessively sexual marketing, etc.
• Items with hygiene concerns: Used sanitary products, etc.
• Pharmaceuticals, medical devices, supplements, cosmetics, colored contact lenses, etc.: Items that require legal licenses, notifications, labeling, or similar compliance, or whose safety or hygiene cannot be verified
• Items not meeting safety standards: Products requiring PSC marks, PSE marks, or other safety labels that lack them
• Recalled items: Items subject to manufacturer recall (collection or repair)
• Items not in your possession: Drop-shipping (purchasing after receiving an order) is prohibited

ROM and Photobook Rules

Cosplay ROMs and photobooks may be listed, but items containing any of the following content cannot be listed:

• Depictions of genitalia or sexual acts
• Unedited exposure of private parts
• Child pornography, or sexual depictions of subjects under 18
• Adult-only (R-18) content
• The title, description, sample images, package images, or similar materials that suggest adult-only content or contain excessively sexual appeals

Photobooks featuring character costume recreations (including swimwear, bunny suits, etc.) or glamour-style photography are permitted.

However, even glamour-style works cannot be listed if they contain sexual acts, exposure of private parts, excessively sexual poses or presentation, or content equivalent to R-18.

COSMA may review ROMs and photobooks more carefully than ordinary items. If COSMA determines that a listing is inappropriate, we may unpublish or delete the listing, or restrict the account. If you are unsure, please contact us before listing.

Listing Tips

Take photos of the actual item

Please include multiple photos of the actual item so buyers can purchase with confidence. If there are stains or damage, include close-up photos of those areas. Worn photos (showing how the costume looks on) are especially helpful.

Include measurements whenever possible

Cosplay costume sizing varies greatly by manufacturer. Including actual measurements (bust, waist, hips, length, etc.) helps prevent post-purchase "doesn't fit" issues. Fit notes like "perfect fit for 165cm average build" are also useful.

Describe the item's condition honestly

Accurately describing an item's condition is a seller's obligation. Misrepresenting the condition may result in seller liability for non-conformity under civil law.

• New: Unused, with tags
• Like new: Try-on only, barely used
• Used a few times: Worn at 1–3 events
• Shows wear: Used multiple times, some deterioration

Set a shipping estimate

Please set an estimated number of days to ship so buyers can judge whether it will arrive in time for their event. In principle, please ship within 3 business days of a completed transaction.

Include character and series names

Enter the character name and series name accurately so your listing is easy to find in search.

Pricing

• Prices can be set between ¥500 and ¥999,999 (extremely low prices are not allowed due to payment processing fees)
• At transaction completion, a payment fee (3.6%) + platform fee (5%) is deducted
• Your take-home amount is shown when you list

Note on the Premiums and Representations Act: Misrepresentations that cause buyers to believe an item is significantly superior to reality (superior goods misrepresentation) or that transaction conditions are significantly more advantageous than reality (advantageous conditions misrepresentation) are prohibited by law.

Transaction Flow

1. List: Enter photos and details and post your listing
2. Purchase: Buyer completes payment (funds are held through Stripe until the transaction is completed)
3. Ship: Seller packs and ships the item, enters tracking number
4. Receipt confirmation: Buyer confirms item arrival
5. Receive payout: After confirmation, funds are transferred to your registered Stripe account

* If receipt is not confirmed, the transaction is automatically completed 14 days after shipping.

Copyright

Cosplay costumes are often based on original character designs, which may raise copyright concerns. Please be aware of the following:

• Officially licensed items: Costumes manufactured under an official license can be resold as secondhand goods.
• Handmade or commissioned items: Selling costumes you made yourself or had made to order is commonly done as disposal of unwanted items made for personal use, but the legal status under copyright law varies by case.
• Prohibited activities: Copying official costume designs without authorization and mass-producing/selling them for profit is highly likely to constitute copyright infringement.

If you have questions about copyright, please consult a specialist (such as a lawyer). The Operator is not in a position to provide legal advice on copyright matters.

Handling Rights Holder Reports

If a copyright or trademark rights holder files a report about a listing that infringes their rights, the Operator will respond as follows:

1. Upon receiving a report, the listing is promptly unpublished.
2. The seller is notified that a report has been filed and the reason for the unpublishing.
3. If the seller wishes to contest, they must contact the Operator within 14 days of the notification with grounds showing no infringement.
4. If no contest is filed, or if the contest is found to have no reasonable grounds, the listing is deleted.
5. If the contest has reasonable grounds, the Operator notifies the rights holder and encourages resolution between the rights holder and the seller.

Secondhand Goods Dealer License

Selling costumes or props you personally used (disposing of unwanted items) generally does not require a secondhand goods dealer license. However, a license (under Article 3 of the Secondhand Goods Dealer Act) may be required in the following cases:

• Repeatedly selling items purchased for resale
• Repeatedly buying and selling goods for profit

For more details, see the FAQ or contact the Community Safety Division of your nearest police station.

Violations

If a listing that violates these guidelines is discovered, the operations team may take the following actions. The specific action taken will depend on the severity and intent of the violation.

• Deletion of the listing
• Warning to the seller
• Temporary restriction of listing or purchasing functions
• Temporary or permanent account suspension

If you find a violation, please use the "Report" button on the item page.

For detailed legal terms, please see the Terms of Service.