| 1997 | Jul. | The DIO Tamashima branch opened. (First DIO store) |
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| 1999 | May. | The DIO Chayamachi branch opened. |
| 2000 | Jun. | The DIO Mizushima branch opened. (First company-owned building / Establishment of the basic opening format to include fresh food) |
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| Nov. | The DIO Okayama Nishi branch opened. | |
| 2001 | Mar. | The DIO Soja branch opened. |
| Jun. | Sales exceeded 5,000,000,000 yen. | |
| Jul. | The head office moved from Tamashima, Kurashiki city to 704-5, Horinan, Kurashiki city. | |
| The central DIO branch opened. (In retailing food we first commenced around-the-clock operations in Okayama prefecture.) |
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| 2002 | Jun. | Sales exceeded 10,000,000,000 yen. |
| 2003 | Dec. | The LAMU Kakogawa branch was opened. (24 hours open) (First LAMU store / First store outside Okayama) |
| Our company was listed on the JASDAQ market. (December 16 / Securities code: 2791) |
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| 2004 | Apr. |
The LAMU Matsunaga branch opened. (24 hours open) (First store in Hiroshima) |
| 2005 | Jun. | The LAMU Sakaide branch opened. (24 hours open) (First store in Kagawa) |
| Oct. | The LAMU Yasugi branch opened. (24 hours open) (First store in Shimane) |
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| Nov. | The LAMU Tottori branch opened. (24 hours open) (First store in Tottori) |
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| 2006 | Feb. | The LAMU Sennan branch was opened. |
| The Ebisuten Company, main business being consultations regarding store development, was established. | ||
| May | The Value 100 Company, a 100 yen discount food and miscellaneous daily goods store, was established. | |
| Our company was listed in the second section of the Tokyo Stock Exchange. | ||
| Jun. | The DIO Toyo branch opened. (24 hours open) (First store in Ehime) |
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| Sep. |
The DIO Naruto Minami branch opened. (24 hours open) (First store in Tokushima) |
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| 2007 | May. | Sales exceeded 50,000,000,000 yen. |
| Jun. | The LAMU Yawata opened.(First store in Kyoto) | |
| 2008 | May | Sales exceeded 60,000,000,000 yen. |
| Aug. | The DIO Tamashima branch moved, and opened in a new store. (24 hours open) | |
| 2009 | May. | Sales exceeded 70,000,000,000 yen. |
| 2010 | May | The LAMU Mizumaki branch opened.(24 hours open)(First store in Fukuoka) |
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| Sales exceeded 80,000,000,000 yen. | ||
| Jul. | The Okayama Distribution center moved from Nadasaki, Minami-ku Okayama city to Akaiwa city. | |
| Sep. | The DIO Kurashiki branch renewal opened. | |
| Dec. | The DIO Hofuminami branch opened. (24 hours open)(First store in Yamaguchi) | |
| 2011 | May. | The LAMU Kyobate branch opened. (24 hours open)(First store in Nara) |
| 2012 | May. | The LAMU Echizen branch opened. (Fukui)(First store in Fukui) |
| Jun. | Our company was listed in the first section of the Tokyo Stock Exchange. | |
| Jul. | The LAMUMART Okayamanoda branch opened. (Okayama)(First LAMUMART store) | |
| 2013 | May. | The DIO Wakayamakita branch opened. (24 hours open/Wakayama) (First store in Wakayama) |
| Jun. | The LAMU Kusatsu branch opened. (24 hours open/Shiga)(First store in Shiga) | |
| October | LAMU Yokkaichi Branch opened in Yokkaichi City, Mie Prefecture. (The 1st store in Mie Prefecture) |
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| 2014 | October | LAMU Ogaki Branch opened in Ogaki City, Gifu Prefecture. (The 1st store in Gifu Prefecture) |
| 2015 | April | Relocation of the Kansai Distribution Center (Kansai DC) to the Konohana Ward, Osaka City |
| May | Rebuilding of the Chugoku Distribution RM Center in Soja City, Okayama Prefecture to start Okayama Chilled TC, Perishable Food PC, and food manufacturing |
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| June | LAMU Tsubata Branch opened in Tsubata Town, Kahoku County, Ishikawa Prefecture. (The 1st store in Ishikawa Prefecture) |
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| December | LAMU Toyohashi Branch opened in Toyohashi City, Aichi Prefecture. (The 1st store in Aichi Prefecture) |
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| 2016 | February | Relocation of the Chugoku DC to the Chugoku Distribution RM Center in Soja City, Okayama Prefecture |
| July | Construction of a cold storage building at the Chugoku Distribution RM Center in Soja City, Okayama Prefecture to start Chugoku Frozen DC |
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| December | Establishment of the Setouchi Maple Farm Company for the dairy farming business (100% investment ratio) |
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| 2017 | April | A consolidated subsidiary, Nishigen Company, opened LAMU Nagaoka Atago Store in Nagaoka City, Niigata Prefecture. (The 1st store in Niigata Prefecture) |
| May | Achieved 150 billion yen annual sales | |
| 2018 | April | Relocation of the Kansai Distribution Center (Kansai DC) to Nishi Ward, Sakai City, Osaka Prefecture |
| May | Matsusaka Company (100% investment ratio, established in November 2017) acquired eight stores in Okayama Prefecture from Matsusaka Company | |
| July | The "July 2018 Heavy Rainfall" caused significant damage to six stores within the group and the Chugoku Distribution Center RM Center | |
| September | Acquired 100% of the shares of Oda Shoten Company, a company operating six food supermarkets in Hiroshima and Shimane Prefectures, and made it a subsidiary | |
| December | Mammy's Co., Ltd. (100% investment ratio, established in October 2018) took over 22 stores from Mammy's Co., Ltd. in Fukuoka, Kumamoto, and Nagasaki Prefectures |
| 2020 | May | Achieved 200 billion yen annual sales |
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| 2021 | June | A new Tokyo Branch opened in Ota Ward, Tokyo |
| 2022 | April | Transitioned from the Tokyo Stock Exchange's First Section to the Prime Market due to a market classification revision |
| August | Established the Kansai Distribution RM Center in Kizugawa City, Kyoto Prefecture, and commenced operations for Kansai Chilled TC, Kansai Frozen DC, Perishable Food PC, and food manufacturing | |
| 2023 | March | Relocated to the new headquarters building at the following address: 297-1 Nishinakashinden, Kurashiki-city, Okayama-prefecture |
| June | Merged Matsusaka Company into the company |