Opinions and Comments


Please contact our customer support line below for your consultations.

Customer Service


Ryukakusan Co., Ltd.
  • Ryukakusan Head Office
  • Postal code:101-0031
  • 2-5-12 Higashi Kanda, Chiyoda Ward, Tokyo
  • TEL / 03-3866-1326
  • Office hours / 10:00~17:00
    (Saturday・Sunday・Holidays not in service)

For opinions and comments other than Japanese,
please contact us by email.

●Precautions and Guidelines on sending comments or inquiry●

  • Any reply given by our company is provided and sent the customer in response to the specific purpose. We ask that our answers not be passed on or used for a secondary purpose.
  • Emails sent to us are being reviewed only during our working hours. Concerning Emails received on Saturdays and Sundays, public holidays, during the year-end to New Year holidays, or on company holidays, please allow us to respond to on the next business day or later.
  • Office Hours 10:00 to 17:00 (Except Saturdays, Sundays, National Holidays and other company holidays.)
  • Given such circumstances such as given large volume of inquiries, it may take longer or not be able to reply.
  • Depending on the contents of inquiry, we may reply through a phone call rather than email.
  • We will handle the personal information and inquiry contents properly. Therefore, we will not disclose or provide any personal information or inquiry contents to any third parties. Please refer to the privacy policy for more information.
  • There are situations we may not able to reply when email addresses are being mistyped, or facing system failures. Please contact us by phone if a reply hasn’t been submitted.
  • Please note that we may not able to reply without given a sufficient information to respond.
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