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2004
                Representative Matsumura works as a freelancer and starts a school teaching Flash.
               
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2006
                Founded Cshool Co., Ltd. with an office in Shinjuku Gyoen.
               
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2006
                Representative Matsumura participated in the launch of the Digital Creation Course (DigiCri) at Kyoto Seika University's School of Design and served as a lecturer until 2019.
               
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2007
                Csul employees teach at DigiCuri
               
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2008
                The first dotFes Tokyo was held in collaboration with Web Designing magazine, and dotFes has been held nationwide approximately every other year since then.
               
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2010
                Involved in launching the gallery "Kara-S" owned by Kyoto Seika University. Established the Kyoto office within Kara-S.
               
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2012
                A permanent desk is set up in a shared office in Shanghai. Looking to do business in Shanghai.
               
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2013
                Moved the office to Yotsuya
               
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2015
                Moved the office to Jimbocho
               
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2016
                DotFes SHIBUYA held in collaboration with DeNA Co., Ltd.
               
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2017
                DotFes KANDA Nishikicho held in collaboration with Sumitomo Corporation
               
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2018
                Organized a children's event, Playful Street, in collaboration with businesses in Kanda Jinbocho
               
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2018
                dotFes2018 Vietnam Danang held in Da Nang, Vietnam
               
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2018
                Held events and workshops mainly in Vietnam and India (later temporarily suspended due to the effects of COVID-19)
               
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2021
                Representative Matsumura participated as a faculty member in the launch of the Kyoto Seika University School of Media Expression.
               
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2023
                Resuming activities in Vietnam and India
               
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2023
                Started web service development in collaboration with Kyoto Seika University Faculty of Media Expression and Dr. Homi Bhabha State University
               
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2023
                Moved the office to Bakuroyokoyama