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Prossell, Inc. 2023

Niigata, Niigata City

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We develop an online platform for entrepreneurship education in upper secondary specialized training schools. The platform provides services for both students and faculty. For students, we will provide on-demand content that allows them stress when accessing information systems, including hundreds of millions of visually impaired who suffer from light sensitivity and color blindness. To relieve this stress, human-friendly information systems with man-machine interfaces (MMI) that match the visual characteristics of various individuals are required. In order to help the world's visually impaired, it is necessary to establish a telemetry system that enables measurement of the visual characteristics of various individuals at any time and from any place and to create an optimized MMI for their characteristics. This telemetry system can only be realized by developing and utilizing advanced ICT, including cloud computing and VR goggles.

Prossell, Inc. 's News & Column
NEW INFORMATION

Prossell HD CEO Yokoyama Takes the Stage for Career Lecture at Kagawa Kosen

2025/12/26

STARTUP LEAGUE

Prossell HD CEO Yokoyama Takes the Stage for Career Lecture at Kagawa Kosen

Prossell Holdings Inc. (Headquarters: Niigata City, Niigata Prefecture; Representative Director and CEO: Kazuki Yokoyama), a company that provides career support for Kosen (National Institute of Technology) students, announced on December 26 that Representative Yokoyama took the stage at the "Kosen-jinkai Career Lecture" held at the National Institute of Technology, Kagawa College (Kagawa Kosen).

2025/12/16

STARTUP LEAGUE

Prossell HD Named Platinum Sponsor of "KOSENJIN SUMMIT 2026"

Prossell Holdings Inc. (Headquarters: Niigata City, Niigata Prefecture; CEO: Kazuki Yokoyama), a company developing career support for technical college (KOSEN) students, announced on December 16 that it has been appointed as a Platinum Sponsor for the "KOSENJIN SUMMIT 2026," the general meeting of the Kosenjin Association, to be held on March 1, 2026.

2025/12/09

STARTUP LEAGUE

Prossell Launches "EnCycle Agent," a Recruitment Service Specialized for Kosen Graduates

Prossell Inc. (Headquarters: Niigata City, Niigata Prefecture; CEO: Kazuki Yokoyama), a company developing career partnership businesses for Kosen (National Institute of Technology/College of Technology) students, announced on December 9 the release of "EnCycle Agent," a recruitment agency service specialized for Kosen graduates.

2025/12/05

STARTUP LEAGUE

Prossell to Host "With KOSEN Career Research Seminar in Nagoya," a Job Hunting Event Exclusive to KOSEN Students

Prossell Inc. (Headquarters: Niigata City, Niigata Prefecture; CEO: Kazuki Yokoyama), which operates a career partner business targeting KOSEN (National Institute of Technology) students, announced on December 5 that it will hold the "With KOSEN Career Research Seminar in Nagoya," a job hunting event exclusively for KOSEN students, on Saturday, February 28, 2026.

2025/11/25

STARTUP LEAGUE

Prossell to Host "With KOSEN Career Research Seminar in Okayama," a Job Fair Exclusively for KOSEN Students

Prossell Inc. (Headquarters: Niigata City, Niigata Prefecture; Representative Director/CEO: Kazuki Yokoyama), which operates a career partnership business targeting KOSEN (National Institute of Technology) students, announced on November 25 that it will hold the "With KOSEN Career Research Seminar in Okayama"—a job hunting event exclusively for KOSEN students—on Sunday, December 7, 2025.

2025/11/14

STARTUP LEAGUE

Three "Kosen"-Centered Companies Form Group, Establish "Prossell Holdings"

Prossell Co., Ltd. (HQ: Niigata City, Niigata), Echigo Tekkosho Co., Ltd. (HQ: Nagaoka City, Niigata), and Prossell Technologies Co., Ltd. (Nagaoka City, Niigata) announced on November 14 that they have become wholly-owned subsidiaries of the newly established "Prossell Holdings Co., Ltd." (HQ: Niigata City, Niigata, CEO: Kazuki Yokoyama) as of November 5, 2025.

Prossell, Inc.'s Main Innovation
INNOVATION

Development of an online platform for entrepreneurship education support for technical college students

We will develop an online platform for entrepreneurial education for colleges of technology. This platform is aimed at both students and teachers.
For students, we will provide on-demand content that allows them to learn the knowledge necessary for starting a business through gamified web and mobile apps, and they can learn at their own pace.
For teachers, we will provide a web app with the function of analyzing and analysing students' viewing data. This will allow them to brush up their educational curriculum.
We do not just provide products, but also strive for continuous improvement and updates. We are working with schools to build a sustainable system to nurture more entrepreneurs from colleges of technology.

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Prossell, Inc. Representative Introduction
REPRESENTATIVE

Representative Kazuki Yokoyama Kazuki Yokoyama
Born in 1998 in Toyama Prefecture. Raised in Niigata City, Niigata Prefecture. Graduated from Nagaoka National College of Technology, Department of Electronic and Mechanical Systems Engineering in March 2020.
Inspired by an idea he had while studying abroad in Finland, he founded Prossel, a voluntary organization centered on online business contests, in November 2019. In June 2020, he established Prossel Co., Ltd., which operates as a career partner for students of National College of Technology. In August of the same year, he joined the Commerce and Industry Department of Nagaoka City Hall. In October of the same year, he entered the Niigata University Graduate School (where he is still enrolled). Director of the National College of Technology Association. NEDO project AR.
Main Achievements Participate in the ICT Startup League in 2023 Selected for J-Startup NIIGATA in 2021
Childhood Dream I participated in national tournaments several times, and played on a team where some of my teammates were active J-Leaguers, so I dreamed of becoming a professional soccer player from my childhood until I was about 20 years old, when I was attending a technical college. I studied English as a student because I wanted to practice with a soccer team overseas.
Influential People, Things, and Events People: "My grandfather and Shuuta Shibuya of Fuller Co., Ltd."
Thing: "One Piece"
Event: "Soccer"
Motivation, Goals, and Ideal World In the summer of 2018, I had the opportunity to study abroad in Finland as a student of Nagaoka National College of Technology. During my time abroad, I participated in a business contest as an extracurricular activity in April 2019, which became a turning point for my life. At the time, the career path of my seniors at the National College of Technology was generally to advance to large companies, and I was planning to follow that trend and advance my career. However, this contest experience gave me the opportunity to think deeply about my activities as an entrepreneur, how to work at a venture company, and how to build my own career.

Based on this experience, I strongly felt that I wanted to provide students at the National College of Technology with an opportunity to seriously think about their careers, so I launched a new internship program in the form of an online business contest, "Online Intern Contest", commonly known as "Prossell Oncon".

We developed "Prossell Scout", a platform that supports the job hunting of students who participated in "Prossell Oncon", and "Prossell Learning", an on-demand educational content for students at the National College of Technology who are looking for employment at entrepreneurs and startup companies.

As for my future vision, I would like to use the "Prossell" brand to provide support to even more students to clarify their career goals and realize them. It is my hope that students will be able to maximize their potential and have a bright future.

Prossell, Inc. Basic Informaton
BASIC
INFORMATION

Company Name Prossell, Inc.
Representative Name Kazuki Yokoyama
Address 1-2 Sasaguchi, Chuo-ku, Niigata City, Niigata Prefecture
Official Site and Social Media Official Website
@prossell_inc | X (Twitter)
Founding Date 2020-06-04T15:00:00.000Z

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