Terms of Service

These Terms of Service ("Terms") govern your use of Relationship Chart Maker (https://soukanzu.jp, "the Service"). By using the Service, you agree to be bound by all of these Terms. The Terms apply to the web version, any future app versions, and all related features (AI diagram generation, gallery, blog).

1. Service Overview

The Service is a web tool for visually creating, editing, and saving relationship diagrams between people, characters, organizations, etc. Core functionality is available without registration. The Premium plan (lifetime $19.99 / monthly $4.99 / supporter lifetime $39.99) unlocks charts with 5+ people, watermark-free saves, AI image generation, and higher AI diagram usage limits.

2. Plans

2-1. Free Plan

• Add, edit, and delete people
• Create relationship lines and labels
• Use built-in templates
• Save images in HD (with watermark)
• Social sharing
• AI diagram generation (with daily quota)
• Browse the gallery

2-2. Premium Plan

The Premium plan can be purchased in three ways. All three unlock the same premium features, except that the Supporter lifetime comes with more AI chart credits:

• Lifetime ($19.99, one-time payment): no auto-renewal — a single payment unlocks premium features permanently
• Supporter lifetime ($39.99, one-time payment): everything in Lifetime, with 400 AI chart credits once when you buy (Supporter lifetime purchases made on or before October 31, 2026 keep AI charts with no daily limit). If a very large number of charts is generated in a short time, generation may be paused temporarily to protect the Service
• Monthly subscription ($4.99/month): renews automatically until canceled

Premium features:

• Create charts with 5+ people
• Premium design themes
• Watermark-free image saving
• PDF / SVG / social-size export
• AI image generation (up to 5 per day)
• AI chart generation (200 credits with the lifetime plan and 400 with the Supporter lifetime, once when you buy; 100 credits a month with the monthly plan; each chart uses 1–3 credits depending on its size)
• Additional features added over time

With the monthly subscription, you can use premium features during the active subscription period, and if you cancel, premium access remains available until the end of the paid period. The lifetime plans require no cancellation and remain active after purchase.

2-3. Other one-time purchases

• Work pass ($2.99, one-time payment): saves the one chart it was bought for without a watermark. Other charts and other premium features are not included
• AI chart credits (20 credits $2.99 / 60 credits $7.99 / 150 credits $17.99, one-time payment): usable for AI charts for 180 days from purchase

3. Payment & Refunds

Premium plan payments (lifetime, supporter lifetime and monthly) and one-time purchases (work pass and AI chart credits) are processed via Stripe Checkout. All prices are in US dollars (USD). Card information is never stored by the Service. Due to the digital nature of the product, refunds for lifetime purchases and paid subscription periods are generally not available. Exceptions may be considered for cases such as a Service-side outage lasting longer than 48 hours that prevented all use.

4. Copyright & IP

4-1. Diagrams you create

Copyright in the diagrams (names, relationships, layout, etc.) you create using the Service belongs to you. By choosing to publish to the gallery, however, you grant the Service a non-exclusive, royalty-free license to display, distribute, and generate thumbnails of that content within the Service.

4-2. Images you upload

If you upload images (e.g. character portraits) from external sources, you warrant that you hold the rights to do so (copyright, likeness, publicity rights, etc.). Uploading photos of actors, celebrities, third-party-shot images, or copyrighted material without permission carries legal risk. The Service is not responsible for the rights status of uploaded images.

4-3. Service content

The source code, UI, logo, documentation, blog posts, and other Service materials are the property of the operator TOMI or their respective rights holders. Reproduction, redistribution, or modification without permission is prohibited. Quoting blog content for review or commentary is permitted under fair-use-style rules (clear attribution, supporting role).

5. Commercial Use

Diagrams created with the Service may be used freely for both commercial and non-commercial purposes. Examples:

• Illustrations in books, magazines, blog articles
• YouTube video explanations and thumbnails
• Corporate presentations and internal training materials
• Paid newsletter or paid fan-zine content
• Plot reference material for commercial novels

Attribution (e.g. "Created with Relationship Chart Maker (soukanzu.jp)") is appreciated but not required. Redistributing screenshots of the tool itself, or reselling the tool as a "diagram service," is not permitted.

6. Gallery Posting Rules

6-1. Acceptable content

• Original creative-work character relationship diagrams (novels, manga, TRPG, etc.)
• Fan diagrams of public works (drama, film, novels)
• Historical figure relationship diagrams
• Fictional organization charts

6-2. Prohibited content

• Defamation or harassment of real individuals
• Sexual depiction or implication involving minors
• Discriminatory or hate-speech content
• Content infringing third-party copyrights, likeness rights, or privacy
• Excessive violence or gore
• Content promoting illegal activity (drugs, weapons trade, etc.)
• Doxxing or exposing personal information (address, phone, real name)
• Commercial advertising, spam, or unrelated promotion
• Repeated identical posts

6-3. Reporting system

If you find a problematic post, please use the report button on the post page or send a report via contact. Posts receiving 3 or more reports are automatically hidden pending review by the operator.

7. General Prohibited Actions

• Imposing excessive load on Service servers (e.g. automated scripts)
• Probing for or exploiting security vulnerabilities
• Attempts to bypass rate limits or quotas
• Tampering with the premium status flag to gain paid features
• Reverse engineering, modifying, or redistributing the Service
• Using the Service for illegal or anti-public-order activity
• Other actions the operator deems inappropriate

8. Access Restriction & Suspension

The Service may take the following actions without prior notice when a user violates these Terms:

• Removal of gallery posts
• Temporary or permanent IP / identifier-based access restriction
• Cancellation of premium plan (no refund)
• Provision of relevant information to law enforcement

9. Service Changes & Discontinuation

The Service may be modified or discontinued at the operator's discretion, with reasonable notice where possible:

• Adding, changing, or removing features
• Adjusting plans and pricing
• Updating these Terms
• Temporarily suspending or terminating the Service

For users who already hold an active premium subscription, the features available under that subscription will continue to be honored for the remainder of the active paid period.

10. Disclaimer

Disclaimers regarding use of the Service are documented separately on the Disclaimer page. Please review both documents.

11. Governing Law

These Terms are governed by the laws of Japan. Disputes related to the Service will be subject to the exclusive jurisdiction of the district court covering the operator's location.

12. Changes to These Terms

The Service may update these Terms as needed. Significant changes will be announced on the Service or via email. Continued use of the Service after changes are posted constitutes acceptance of the updated Terms.

13. Contact

Questions about these Terms: contact form or contact@soukanzu.jp.