Japan Communications Inc. (Stock code: 9424, hereinafter referred to as "JCI") is pleased to announce that JCI invests in and collaborates with SouSou, inc., (Head office: Kawaguchi, Saitama, Representative Director: Kazusa Kusaka, hereinafter referred to as "SouSou"), a social problem-solving venture company that operates an end-of-life platform that connects people's will.
"SouSou" is a venture company that was born because of JCI's FPoS, making the most of the authenticity and identity that JCI's FPoS guarantees.

Naohisa Fukuda, president and CEO of JCI, comments “Our mission is to provide safe and secure telecommunications since our founding. We developed FPoS, which is our patented technology to enable secure communications on the Internet. I am truly pleased that a venture company which I fully embrace has startup and launched a service that maximizes the value of FPoS.”

1. Background of the investment and collaboration
   With the declining birthrate and aging population, the increase in single-person households, and the trend toward nuclear families, the question of "how to communicate post-death wishes and procedures to family members without burdening them" is a social issue.
   

   In response to this social issue in the end-of-life care field, SouSou provides the end-of-life care platform "SouSou," which makes the most of the five features of our FPoS, and is attracting attention as a service that achieves a high level of safety and convenience.

   【 Five features of FPoS, which SouSou utilizes 】

   • ➀ Reliable identity verification through My Number Card signature validation using the Public Personal Authentication Service (JPKI)
   • ➁ Reliable user authentication (log-in) that prevents impersonation and hacking
   • ➂ Reliable personal data linkage across multiple service providers
   • ➃ Reliable verification of the individual's intention through a legally valid digital signature using a certified digital certificate under the Digital Signature Act
   • ⑤ Detection of Changes in Current Status Information (Facts Regarding User Death or Relocation Overseas) using myJPKI

   SouSou is one of the earliest companies to integrate the FPoS library into its app, and we expect that SouSou will provide technical support as FPoS spreads to other businesses in the future.
   Based on this background, we have decided to make this investment, with the aim of supporting the further development of venture companies and new businesses that utilize FPoS.

2. Investment Overview
   The overview of the investment in SouSou is as follows:
   Investment amount: Approximately 15 million yen
   Investment date: August 31, 2025
   *SouSou press release URL：https://sousou-official.com/news/pre-seriesA_02.html

3. About SouSou
   Company Name: SouSou, inc.
   Location: 1, Honbasu, Kawaguchi City, Saitama Prefecture, Japan
   Representative: Kazusa Kusaka, Representative Director
   Business activity: Development of an electronic technology-based end-of-life platform and provision of various services utilizing this platform
   Date founded: August 17, 2022

   SouSou, inc. was founded in August 2022 with the mission of "giving shape to human connection." Following the death of his father, the founder and representative director, who has worked on numerous digital technology projects at a major consulting firm, developed the "SouSou" end-of-life platform (smartphone app) to provide a "new end-of-life experience that is only possible with digital technology." The company aims to further expand its services through business partnerships with a variety of partner companies in the digital and end-of-life fields.
   Corporate website: https://sousou-official.com/

About Japan Communications Inc. (JCI)
Japan Communications Inc. (JCI), founded in 1996, is a pioneer who created the MVNO market and has brought innovation to the telecommunications industry. While JCI has established a stable profit model in their main business, simple and rational mobile communication services, JCI is aiming for further growth. JCI has strengths in patented technologies such as the mobile leased line "Closed SIM-to-SIM Communication" and the digital authentication technology "FPoS," and is focusing on providing mobile communication services and digital authentication infrastructure based on the authentication technology. The PCI DSS-certified mobile leased line is adopted by high-security sectors, such as police and bank. The FPoS supports security at the highest global standards and convenience. Under the mission of "carrying bit in safety and security," JCI is aiming for developing social infrastructure such as secure mobile environment beyond national borders and is working on sustainable growth and improving corporate value.