Form 6-K Medirom Healthcare Techn For: May 28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of May, 2026

Commission File Number 001-39809

MEDIROM HEALTHCARE TECHNOLOGIES INC.

(Translation of registrant’s name into English)

2-3-1 Daiba, Minato-ku

Tokyo 135-0091, Japan

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

☒ Form 20-F ☐ Form 40-F

INFORMATION CONTAINED IN THIS FORM 6-K REPORT

Issuance of Press Release

On May 28, 2026, MEDIROM Healthcare Technologies Inc. (the “Company”) issued a press release announcing its major Key Performance Indicators, or KPIs, for the first quarter of 2026. A copy of the press release, dated May 28, 2026, is furnished as Exhibit 99.1 to this Report on Form 6-K.

The information furnished in this report on Form 6-K (including the exhibit hereto) shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, as amended, except to the extent specifically provided in such a filing.

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.