| 1948 | Started tugboat business in Kitakyushu city, with towing service as a main
business.
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| 1967 | Founded Dokai Tugboat Ltd. Ichiro Imada assumed the presidency. |
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| 1971 | Absorbed Hoyo Sempaku Ltd. Increased a capital to 30,000,000 yen. |
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| 1973 | Opened Hakata branch. |
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| 1975 | Opened Nagasaki branch. |
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| 1987 | Opened Tokyo head office. |
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| 1995 | “Choyo Maru” went into service |
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| 1996 | Tamihiro Imada assumed the presidency. |
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| 1996 | Purchased a supply boat, and converted it into a multipurpose vessel “Asean Maru”. |
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| 1996 | “Tobiume Maru” went into service. |
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| 1999 | Increased capital to 34,120,000 yen. |
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| 2000 | Changed company name to Dokai Marine Systems Ltd. |
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| 2000 | Cable layer “Koki Maru” went into service. |
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| 2001 | “Koshin Maru”, newly built as a special work vessel in 1998 was converted into a cable layer, and went into service in 2001. |
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| 2010 | “Hibiki” went into service. |
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| 2012 | “Tubasa” went into service. |
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| 2015 | “Tsushima”, went into service. |
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| 2016 | “Asahi” went into service. |
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| 2017 | “Misaki” went into service. |
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| 2017 | Hisao Imada assumed the presidency. |
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