MONSTER CARDS End User License Agreement (EULA)


This English translation is provided for reference purposes only. In the event of any conflict or discrepancy between the Japanese version and this English translation, the Japanese version shall prevail in all respects (see Article 14, Paragraph 2).


GasaiGames ("we," "us," or "our") develops and operates the PC game software "MONSTER CARDS" (the "Game") and downloadable content related to the Game ("DLC"). All persons who use the Game ("Users") must agree to this Agreement before enjoying the Game.


Article 1 (Agreement to this Agreement)

1. Users may not use the Game unless they agree to this Agreement.

2. When a User actually uses the Game downloaded to an information terminal, the User shall be deemed to have agreed to this Agreement.

3. If a User is a minor, the User must use the Game after obtaining the consent of a parent or other legal representative. When a minor User uses the Game, the User shall be deemed to have obtained the consent of a legal representative.

4. Users shall use the Game in accordance with the provisions of this Agreement.


Article 2 (Amendment of this Agreement)

1. We may amend this Agreement without obtaining the individual consent of Users, pursuant to Article 548-4 of the Civil Code of Japan, in any of the following cases:

(1) When the amendment conforms to the general interest of Users
(2) When the amendment is not contrary to the purpose for which this Agreement was made, and is reasonable in light of the necessity of the amendment, the appropriateness of the amended terms, and other circumstances relating to the amendment

2. When amending this Agreement pursuant to the preceding paragraph, we will, by a reasonable period prior to the effective date, announce the fact that this Agreement will be amended, the content of the amended Agreement, and its effective date, by posting on the news section of the Game's page on Steam or by other means we deem appropriate.

3. If a User uses the Game on or after the effective date, the User shall be deemed to have agreed to the amended Agreement.


Article 3 (Means of Communication)

1. Communications from us to Users regarding the Game will be made by posting on the news section of the Game's page on Steam or by other means we deem appropriate.

2. Communications from Users to us regarding the Game shall be made through the "Contact Form" provided on the website we operate, the contact email address we designate, the Discord server we operate, or other means we designate.


Article 4 (Conditions of Use)

1. In using the Game, Users shall prepare and provide, at their own responsibility and expense, information terminals (devices), communication equipment and means, electric power, and the like, and shall maintain them while using the Game.

2. Users acknowledge in advance that they may not be able to use the Game unless they comply with the specification standards we define (including, but not limited to, supported operating systems, performance, and features).


Article 5 (User Content)

1. In this Agreement, "User Content" means any and all data created, registered, or transmitted by a User using the features of the Game, including cards (including card names, illustrations created with the Game's drawing features, flavor text, parameters, and the like), audio incorporated into cards, decks, sleeves, drawing data created with the various features of the Game, avatar settings, room names, and other data entered or transmitted by Users.

2. Copyright and other rights in User Content are reserved to the User or the rightful holder of such rights. However, Users grant us a royalty-free, non-exclusive license to use User Content to the extent necessary for the provision, operation, and improvement of the Game and services related to the Game (including reproduction and storage on servers we manage, and transmission to and display on other Users' terminals).

3. Users may use or transmit as User Content only content that falls under any of the following:

(1) Content the User created themselves
(2) Content for which the necessary rights or lawful permission have been obtained
(3) Content used within the scope permitted by derivative-work guidelines or similar rules published by the right holder

Music, videos, characters, or other works in which third parties hold rights may not be used in User Content without the permission of the right holder or beyond the scope permitted by the guidelines or similar rules referred to in item (3) above. The User who created or transmitted the User Content shall be responsible for the use of third-party copyrighted works and the like in that User Content (including compliance with the guidelines or similar rules referred to in item (3) above).

4. Users must not create or transmit User Content that falls under any of the following:

(1) Content that infringes the intellectual property rights, portrait rights, privacy, or other rights of third parties
(2) Content that is obscene, or excessively violent or cruel
(3) Content that constitutes discrimination, defamation, or harassment against particular individuals, groups, or attributes
(4) Content that violates laws or regulations, or is connected with criminal activity
(5) Content that is otherwise contrary to public order and morals, or that we reasonably deem inappropriate

5. If we reasonably determine that User Content violates, or is likely to violate, any of the preceding paragraphs, or if a right holder or other third party makes a claim of rights infringement, we may, without prior notice to the User, take measures within the scope practicable for us in connection with the provision of online play — such as deleting the User Content stored on our servers, suspending its transmission via our servers, and restricting participation in online play — to the extent necessary and reasonable. We shall not be liable for any damage incurred by Users as a result of such measures, except in cases of our willful misconduct or gross negligence.

6. We cannot directly delete or otherwise take measures against User Content stored on a User's terminal. If we so request in connection with the measures under the preceding paragraph, the User shall cease using and transmitting the relevant User Content in online play.

7. We are under no obligation to screen User Content in advance.

8. Any dispute arising between Users or with third parties in connection with User Content shall be resolved at the responsibility and expense of the User concerned, and we shall not be involved in, nor be liable for, such disputes, except in cases of our willful misconduct or gross negligence.


Article 6 (Online Play)

1. Online play in the Game is provided in a format in which only persons with whom the User who created a room has shared the room ID may participate. Room IDs shall be managed at the User's own responsibility, and we shall not be liable for any consequences arising from the sharing of a room ID.

2. If a User shares a room ID with unspecified or numerous persons in connection with streaming, events, or the like and allows them to participate, the User hosting the room and the participating Users shall, at their own responsibility and judgment, handle any trouble, receipt of inappropriate User Content, or similar matters arising within that room.

3. In online play, User Content (including card illustrations, audio incorporated into cards, sleeves, drawing data, and the like) is transmitted via our servers to the terminals of other participants in the same room, where it is displayed and played. Users shall participate in online play with prior acknowledgment of this.

4. We shall not be liable for disconnections, delays, loss of data, or the like attributable to a User's communication environment, network congestion, equipment malfunction, or similar causes.


Article 7 (Prohibited Acts)

Users must not engage in any of the following acts in using the Game:

(1) Acts that interfere with the operation of the Game, such as making excessive inquiries or engaging in defamation, threats, or unreasonable demands against us
(2) Criminal acts, torts, or other acts that violate domestic or foreign laws and regulations
(3) Acts contrary to public order and morals
(4) Acts of analyzing the Game by decompiling, disassembling, reverse engineering, or the like
(5) Acts of modifying or tampering with the Game
(6) Acts of redistributing, reselling, lending, or transferring the Game, such as by copying all or part of it
(7) Acts of creating tampered save data, card data, or other unauthorized data, or transmitting such data to other Users
(8) Acts of operating the Game fraudulently using cheat tools, external tools, or the like
(9) Acts of placing an excessive load on the Game's servers or network, or obstructing their operation
(10) Acts of impersonating another User or a third party
(11) Acts of creating or transmitting content prohibited under Article 5
(12) Any other acts that we reasonably deem inappropriate

If we reasonably determine that a User has engaged in, or is likely to engage in, any of the acts listed in the preceding items, we may, without prior notice to the User, take measures within the scope practicable for us in connection with the provision of online play — such as restricting participation in online play — to the extent necessary and reasonable. We shall not be liable for any damage incurred by Users as a result of such measures, except in cases of our willful misconduct or gross negligence.


Article 8 (DLC and Purchases)

1. The purchase of, payment for, and refund of DLC shall be governed by the terms and procedures established by Valve Corporation, the operator of Steam. We will not provide refunds for purchased DLC except as provided under Steam's terms.

2. If a minor purchases DLC, the minor shall obtain the prior consent of a parent or other legal representative.


Article 9 (Changes, Termination, and Suspension of the Game)

1. We may change all or part of the content of the Game without prior notice to Users.

2. We may terminate the provision of all or part of the Game at our discretion. When terminating the provision of all or part of the Game, we will, except in cases of emergency, announce or notify Users of the termination in advance by a method we deem appropriate.

3. We may temporarily suspend all or part of the online features of the Game without prior notice to Users in cases of server maintenance or failure response, communication failures, or other unavoidable circumstances.

4. We shall not be liable for any damage incurred by Users as a result of changes, termination, or suspension under this Article, except in cases of our willful misconduct or gross negligence.


Article 10 (Disclaimers)

1. We make no warranty, express or implied, that the Game and the services provided through the Game, including DLC, are free of any de facto or legal defects, including with respect to accuracy, completeness, validity, reliability, safety, legality, or fitness for a particular purpose. We also do not warrant the absence of defects, errors, or bugs relating to security or the like.

2. We make no warranty with respect to the following matters concerning the Game:

(1) That it will operate normally on all information terminals
(2) That it will operate normally after updates or upgrades to operating systems or the like
(3) That it will operate normally after changes to the operating policies, terms, or the like of platform operators, including Steam

3. We do not warrant to Users that we will remedy, at our own responsibility and expense, any defects referred to in the preceding two paragraphs.

4. Except in cases of our willful misconduct or gross negligence, we shall not be liable for any damage or trouble incurred by Users in connection with the use of the Game. Even where we are liable, except in cases of our willful misconduct or gross negligence, the scope of our liability for compensation shall be limited to direct and ordinary damages actually incurred by the User.

5. Notwithstanding this Article and other disclaimer provisions of this Agreement, if any such disclaimer is not permitted under the Consumer Contract Act of Japan or other mandatory laws and regulations, that provision shall not apply to that extent.


Article 11 (Intellectual Property Rights)

Copyright and other intellectual property rights in the Game and in all programs, images, audio, text, and other content related to the Game (excluding User Content) belong to us or to the rightful holders who have licensed their use to us.


Article 12 (No Assignment of Rights and Obligations)

Users may not assign to any third party, or offer as security, their status under this Agreement or any rights or obligations under this Agreement without our prior written consent.


Article 13 (Severability)

Even if any provision of this Agreement, or any part thereof, is held invalid or unenforceable under laws or regulations, the remaining provisions of this Agreement shall continue in full force and effect.


Article 14 (Governing Law and Jurisdiction)

1. The formation, validity, interpretation, and performance of this Agreement shall be governed by and construed in accordance with the laws of Japan.

2. If this Agreement is prepared in Japanese and in any language other than Japanese, the Japanese version shall prevail in all respects in the event of any conflict or discrepancy between the language versions.

3. Any dispute arising between us and a User in connection with the services related to the Game or this Agreement shall be subject to the exclusive agreed jurisdiction of the Tokyo District Court or the Osaka District Court as the court of first instance.


Supplementary Provisions

Enacted: August 12, 2022
Revised: July 30, 2026
Effective Date: August 5, 2026