This website ( domain) is operated and managed by Tamasu Co., Ltd. Before using the website, please read the following terms of use carefully and use the site only if you agree to these terms. By using this website, you agree to all of the following terms and conditions. Please note that the terms of use may be changed as necessary, so please check the contents each time you use the service.


The copyright of the content posted on this website belongs to Tamasu Co., Ltd. or the rights holder who has authorized the use of the content. In addition, (except for copying for personal use or other cases permitted by copyright law) copying, transmitting, distributing, revising, translating, etc. this homepage or its content without the permission of the copyright holder is a violation of copyright law.


BUTTERFLY is a registered trademark of Tamasu Co., Ltd. Other product names, service names, logos, etc. on this website are trademarks of Tamasu Co., Ltd. or the rights holder who has authorized Tamasu Co., Ltd. to use them. Therefore, these cannot be used without prior notice and permission from Tamasu Co., Ltd. Names of other companies or product names, service names, logos, etc. of other companies on this website are quoted only for displaying them and may be registered trademarks or pending trademarks of these companies.

Use of information on this website

You may download, view, copy and print the documents viewed from this website and the graphics contained in the documents (collectively, the "Documents"), subject to the following conditions: The documentation may be used for personal information only and for non-commercial purposes only. The documentation may not be modified under any circumstances.


Although this website links to other websites, Tamasu Co., Ltd. does not guarantee the contents of those other websites. If you use those other websites, please comply with the terms of use of each website and use at your own risk. The same applies if you link to this website from another website.

Recommended OS and browsers

This site requires the following browsers for a safer and more enjoyable experience. Please check the version of the software you are using before downloading it.


–The latest version of Microsoft Edge
–The latest version of Google Chrome
–The latest version of Mozilla Firefox


–The latest version of Safari


–The latest version of Safari
–The latest version of Google Chrome


–The latest version of Google Chrome


This website uses SSL / TLS on all pages to ensure the security of personal information. The page may not be displayed if the web browser you are using does not support it, or if you are connected through a firewall from an office. In that case, please note that you cannot use it.


This website uses cookies. Cookie is a function that stores information that a customer has visited a website in the terminal you are using. By using cookies, you can obtain information such as the number of website visits and pages visited on your device. The information collected through cookies does not include any information that can identify the individual customer. We use cookies to measure websites in order to understand the usage status of our customers and improve our services. You can also disable the cookie function by setting your browser. Even if you disable the cookie function, there is no problem in using the website.

The following tool is used for analysis using cookies, and information may be provided to the tool provider.

Google Analytics Google LLC


This website uses JavaScript to make it more convenient and comfortable to use. Please note that if JavaScript is disabled in your browser, it may not function properly or may not be displayed correctly due to problems such as not being displayed correctly.


We strive to keep the information, products and services posted on this website up-to-date and accurate. However, it can be incomplete and inaccurate. Unless otherwise specified in the contract between the customer and Tamasu Co., Ltd., all information, products, services, etc. are not guaranteed for their accuracy and completeness. Tamasu Co., Ltd. is not responsible for any damage or loss of profit incurred by the customer or a third party due to the connection or use of this website. Tamasu Co., Ltd. reserves the right to change, modify, add, suspend or delete this website at any time without notice, but does not undertake any obligation to do so.

Governing law and jurisdiction

Unless otherwise specified, the use of the website and the interpretation and application of the site policy shall be governed by the laws of Japan. In the event of a dispute regarding the website, the district court that has jurisdiction over the location of our head office shall be the exclusive agreement jurisdiction court of the first instance.