[6-K] Medirom Healthcare Technologies Inc. Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Medirom Healthcare Technologies Inc. furnished a Form 6-K for October 2025. The filing provides an interim report for the six months ended June 30, 2025 and related Inline XBRL files.

The company states that this Form 6-K, including its exhibits, is incorporated by reference into its Form F-3 registration statement (File No. 333-290161) and will form part of that registration statement unless superseded by later filings.

Medirom Healthcare Technologies 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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 6-K

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Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16
Under the Securities Exchange Act of 1934

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For the month of October 2025

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MEDIROM HEALTHCARE TECHNOLOGIES INC.

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Commission File Number 001-39809

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(Translation of registrant’s name into English)

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2-3-1 Daiba, Minato-ku
Tokyo 135-0091, Japan
(Address of principal executive offices)

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

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Form 20-F ☒ Form 40-F ☐

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EXPLANATORY NOTE

This current report on Form 6-K, including the exhibits hereto, is incorporated by reference into the Registration Statement on Form F-3 (File No. 333-290161) and shall be a part of such registration statement from the date on which this current report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

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Exhibit Index

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Exhibit No.		Description
99.1	​	Interim report of MEDIROM Healthcare Technologies Inc. for the six months ended June 30, 2025
101.INS	​	Inline XBRL Instance Document-this instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	​	Inline XBRL Taxonomy Extension Schema Document
101.CAL	​	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	​	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	​	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	​	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	​	Cover Page Interactive Data File (embedded within the Inline XBRL document)

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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.

Date: October 21, 2025	By:	/s/ Fumitoshi Fujiwara
	Name:	Fumitoshi Fujiwara
	Title:	Chief Financial Officer

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FAQ

What did Medirom (MRM) file?

A Form 6-K furnishing an interim report for the six months ended June 30, 2025, plus Inline XBRL exhibits.

How does this 6-K affect Medirom’s Form F-3?

The 6-K, including exhibits, is incorporated by reference into Form F-3 (File No. 333-290161) and becomes part of that registration statement.

What period does the interim report cover for MRM?

The six months ended June 30, 2025.

Which exhibits accompany the filing?

Exhibit 99.1 (interim report) and Inline XBRL documents (schema, calculation, definition, label, presentation) and the cover page data file.

Is Medirom a foreign private issuer?

Yes. The filing is a Form 6-K report of a foreign private issuer.

What is the SEC file number for Medirom’s F-3?

333-290161.

Who signed the filing for Medirom?

Fumitoshi Fujiwara, Chief Financial Officer.