- 1919
- Ms. Soyo Ishii established [Izumiya Art Supply Store] in Shibuya, Tokyo
- 1931
- Relocated the store near Atelier Village at the west exit of Ikebukuro
- 1950
- Incorporated Izumiya Limited Company
- Ms. Fusako Ishii became CEO
- 1957
- Opened the Shinjuku Store in Tokyo
- 1961
- Commenced importing "Industrial Clays."
- 1965
- Started export of art supplies to Europe and the U.S.
- 1967
- Relocated headquarters to Sendagaya in Shibuya, Tokyo
- 1968
- Established [Magic Marker Corporation of Japan] (current [Too Marker Product]), a joint venture with Magic Marker Corporation in the U.S.
- 1969
- Opened the Osaka Branch
- Opened the Umeda (Osaka) Store
- Established [bonny Corporation](current [bonnyColArt]), a joint venture with ColArt in Britan.
- 1970
- Reorganized into Izumiya Corporation
- 1972
- Opened the Ochanomizu Store in Tokyo
- 1973
- Opened the Nagoya Office
- Opened the Yokohama Store
- 1974
- Opened the Sapporo Local Office
- 1977
- Opened the Sendai and Fukuoka Offices
- 1979
- Relocated headquarters to Ebisu, Tokyo
- 1981
- Commenced domestic production of "Industrial Clay J-525."
- 1984
- Eiichi Ishii became the new president
- 1985
- Opened Presen House Shinjuku, Tokyo
- 1986
- Developed "Clay Modeling Film" and released
- 1987
- Developed the design marker, COPIC, and started the sales
- Opened the Kyoto Office
- 1991
- Established the [Izumiya Software International Corporation] (current [SOFTWARE Too Corporation]) for software development business
- 1992
- Renamed Izumiya Corporation to Too Corporation
- Established Presen House Too Corporation
- 1993
- Developed COPIC SKETCH and started sales. Won the Good Design Award
- Established Font Too Corporation for sales of digital fonts and software
- 1999
- Sales department for art supplies, clay, educational materials, equipment, design and modeling materials grouped up into an organization and separated from Too Corporation as a new entity "TOOLS Corporation."
- 2000
- Opened the web shopping site dedicated for design and creative tools, NetShop.Too
- Established Too Staff Service INC. for temporary help business
- Established Too Service & Support INC. for support business
- 2002
- Relocated headquarters to Setagaya, Tokyo
- 2007
- Obtained the certification of ISO27001, the international standard for information security management system
- 2009
- International sales department for selling clays, modeling materials, equipment, educational materials for automotive design separated from TOOLS Corporation. This entity became the "TOOLS INTERNATIONAL Corporation."
- 2011
- Eiichi Ishii became CEO Chairman and Gota Ishii became CEO President
- 2012
- Relocated headquarters to Toranomon, Tokyo
- 2013
- Established G-Too Corporation
- 2019
- Established Too Corporation America
- Established Too (Shanghai) Corporation
- Celebrating the 100th anniversary of business founding
- 2021
- Established Too Digital Marketplace Inc.
