Clisk Inc. (Headquarters: Shinjuku-ku, Tokyo; Representative Director: Hiroshi Chitose; hereinafter referred to as "Clisk"), which operates a self-operated web media business, has launched a "20th Anniversary Special Feature Page" on its official website starting July 1, 2026 (Wed.) to commemorate the company's 20th anniversary and the 20th anniversary of "Tsushinsei Koko Navi," the correspondence high school portal site it operates. "Tsushinsei Koko Navi" has been used by over 170,000 users in total and lists information on over 200 correspondence high schools and support schools nationwide. This special feature page will look back at the 20 years of changes surrounding correspondence high schools through timelines and data, along with the history of "Tsushinsei Koko Navi," and will communicate the diversification of learning and the future of correspondence high schools through interviews with experts. Additionally, a 20th-anniversary related campaign to support career choices is planned for this summer. Details will be announced on "Tsushinsei Koko Navi" as soon as they are decided. Clisk x Tsushinsei Koko Navi 20th Anniversary Special Site Special Feature Page URL: https://clisk.co.jp/20th From "Can I Really Get a High School Diploma?" to "An Option to Learn My Way": 20 Years of Change Surrounding Correspondence High Schools Correspondence high schools are gaining attention not only for their role in supporting students with experience of school refusal but also as diverse learning options that cater to the individual circumstances and aspirations of each student. Twenty years ago, when "Tsushinsei Koko Navi" was first launched, parents and students sometimes expressed anxieties and doubts about the system itself, such as "Is a correspondence high school really a high school?" and "Can I obtain a high school diploma if I graduate?" Today, awareness of correspondence high schools has spread, and the perspective on choosing a school has also changed. Students and