Koharu Tech Notes

Information we collect

The Site collects the name, email address, subject, and message submitted through the contact form. We may also temporarily process technical data such as IP address, browser information, and access time to prevent abuse and investigate failures.

How we use information

We use information to respond to inquiries, correct articles, improve site operation and security, analyze traffic, and deliver advertising. We do not use it beyond these purposes unless required by law.

Contact-message delivery

Contact submissions are delivered to the administrator through Cloudflare Email Service and are not stored in the Site application database. Delivery and receiving email providers may process and retain the data as needed for delivery and security.

Article-list display preference

The Site stores your selected article-list layout in your browser's localStorage so it remains selected after a reload. The value is used only to adjust the display in the same browser. It contains no personal information such as your name or email address and is not sent to the Site server or third parties. Clearing the browser's site data also removes this preference.

Google Analytics

Analytics starts by default in Japan. Outside Japan, or when your region is unknown, it starts only after permission. We use only the country code in a same-site Cloudflare response for this decision, without storing or forwarding its IP address or other diagnostic values. Refusal blocks Google tags and deletes existing analytics cookies. Change your choice anytime using Analytics settings in the footer. Choices are stored for one year in a host-only cookie and localStorage; stored refusals remain respected.

Contact, admin, and error pages are excluded. Page and referrer URLs omit queries and fragments, and search pages use a generic title. Scrolls, outbound clicks, video activity, and downloads may be measured; search terms and form interactions are not collected. Google signals and analytics data use for advertising personalization are disabled.

The Site uses Google Analytics to understand and improve site usage. Analytics may use cookies and process visited pages, referrers, device and browser data, and approximate location. SeeGoogle’s explanationfor how Google uses data from partner sites. You can use theGoogle Analytics opt-out browser add-onto disable measurement.

Google AdSense and cookies

Ads load only in Japan when analytics is allowed. Refusal also stops advertising tags. Outside Japan or when the region is unknown, ads remain disabled until a certified advertising consent platform is implemented. Analytics permission is separate from advertising consent outside Japan.

The Site uses Google AdSense. Third-party vendors, including Google, may use cookies to serve ads based on prior visits to this and other sites. Google’s advertising cookies may be used to show personalized ads. You can disable personalized advertising throughGoogle Ads Settings. You can also delete or reject cookies in your browser, although this may affect some features.

Sharing and security

We do not disclose personal information to third parties except with consent, as required by law, or to service providers needed for the purposes above. We take reasonable measures to prevent unauthorized access, disclosure, or alteration.

Changes and contact

We may revise this policy when laws or services change. Material changes will be posted here. Questions about this policy can be sent through thecontact form.

Effective: August 27, 2026 / Last updated: October 4, 2026