- February 1997
- Establishment of Hasegawa Kosan Co., Ltd.
- December 1998
- Launch of agency business operations by Osoji Honpo housecleaning company
- March 2000
- Launch of franchise chain business operations by Osoji Honpo
- June 2002
- Launch of Irise at-home acupuncture, moxibustion, and massage services
- July 2003
- Opening of first Irise private nursing home
- June 2005
- Launch of franchise chain business operations by Kutsu Senka shoe and bag maintenance company
Launch of Meister Coating house interior surface coating services
- October 2007
- Launch of Maid Service housekeeping support services (later renamed "Kaji No Tatsujin" )
- April 2009
- Opening of first Taiyo-no-ko nursery school and launch of childcare support service business
- April 2010
- Launch of franchise chain business operations by Meister Coating house interior surface coating service company
Launch of Warabeuta babysitting services
- February 2011
- Launch of Smile SUPPORT staffing services specializing in nursing care, child daycare, and senior care
- October 2011
- Change of the company name to Hasegawa Holdings Co., Ltd. , in conjunction with the transition to a holding company structure
- September 2012
- Launch of food service business operations, primarily focused on catering contracting
- April 2013
- Launch of franchise chain housekeeping business operations (later renamed "Kaji No Tatsujin")
- September 2013
- Launch of franchise chain business operations by KEiROW at-home acupuncture, moxibustion, and massage company
- August 2016
- Establishment of a special subsidiary for promoting the employment of persons with disabilities by the HITOWA Group
- November 2017
- Change of the company name to HITOWA Holdings Co., Ltd.
- February 2019
- Establishment of Kids Life Labo. , an association dedicated to personnel development and research in the area of early childhood education and childcare
- September 2020
- Launch of the "Raku Racoon " business matching site that connects condominium management and real estate brokers with house cleaning companies
- April 2021
- Launch of "MY PANTRY" ingredient sales services for senior nursing care facilities
