Form SCHEDULE 13D/A Medirom Healthcare Techn Filed by: Eguchi Kouji

Items 5(a) and 5(b) of the Schedule 13D are hereby amended and restated as follows: The information set forth in the cover pages of this Schedule 13D is hereby incorporated by reference into this Item 5. Kouji Eguchi beneficially owns an aggregate of 2,031,558 Common Shares, representing 25.11% of the outstanding Common Shares. For purposes of this Statement, Mr. Eguchi has assumed that the total number of the Issuer's issued and outstanding Common Shares is 8,088,450, which is based on (i) 7,901,950 Common Shares issued and outstanding as of June 30, 2025, as reported in the Issuer's Form 6-K for the period ended June 30, 2025, filed by the Issuer with the SEC on October 21, 2025, and (ii) 186,500 Common Shares that may be issued upon exercise of stock options held by Mr. Eguchi that are exercisable within 60 days from the date hereof, which are deemed to be outstanding for the purpose of computing the percentage of outstanding securities owned by Mr. Eguchi. COZY beneficially owns an aggregate of 47,543 Common Shares, representing 0.60% of the outstanding Common Shares. As COZY is 100% owned by Mr. Eguchi, he has sole voting and dispositive power over these Common Shares and is deemed to be the beneficial owner of the Common Shares held by COZY. For purposes of this Statement, COZY has assumed that the total number of the Issuer's issued and outstanding Common Shares is 7,901,950, as reported in the Issuer's Form 6-K for the period ended June 30, 2025, filed by the Issuer with the SEC on October 21, 2025. The Reporting Person is also the holder of one Class A Share of the Issuer. The Issuer has one Class A Share issued and outstanding as of the date of this Amendment No. 1.

See item 5(a) immediately above.

Item 5(c) of the Schedule 13D is hereby amended and restated as follows: On August 27, 2026, Mr. Eguchi transferred 79,945 common shares to an unrelated third party for no consideration.

Item 6 of the Schedule 13D is hereby amended and restated as follows: The relationships between the Reporting Persons described in Items 2 and 5(a) above are incorporated herein by reference. In addition, Kouji Eguchi holds 186,500 stock options of the Issuer, granting Mr. Eguchi the right to purchase up to 186,500 Common Shares as detailed below. Total Total Number Number of of Common End of Exercise Stock Shares Beginning of Exercise Price Options Underlying Grant Date Exercise Period Period (per share) Granted Stock Options 10/30/2020 10/1/2021 9/30/2026 JPY 2,000 150,000 150,000 7/18/2025 7/18/2026 7/17/2030 $ 1.74 36,500 36,500 The stock options held by Mr. Eguchi granted in July 2025 may only be exercised upon the achievement of certain revenue targets by the Issuer, which are set forth in more detail in the 11th Series Stock Option Allotment Agreement, a copy of which is attached hereto as Exhibit 99.3 (the "11th Series Option Agreement"). The foregoing description of the stock options is a summary only and does not purport to be complete and is qualified in its entirety by the full text of the 8th Series Stock Option Allotment Agreement, a copy of which is attached hereto as Exhibit 99.2, and the 11th Series Option Agreement, which together are incorporated herein by reference.

99.1 Joint Filing Agreement 99.2* 8th Series Stock Option Allotment Agreement, dated October 15, 2020, between the Issuer and Kouji Eguchi [English Translation] (incorporated by reference to Exhibit 99.2 to Amendment No. 1 to the Schedule 13D filed with the SEC on September 2, 2025). 99.3*11th Series Stock Option Allotment Agreement, dated July 7, 2025, between the Issuer and Kouji Eguchi [English Translation] (incorporated by reference to Exhibit 99.3 to Amendment No. 1 to the Schedule 13D filed with the SEC on September 2, 2025). 99.4*Share Transfer Agreement, dated August 27, 2026. *Certain personally identifiable information in this exhibit was omitted pursuant to Item 601(a)(6) of Regulation S-K by means of redacting a portion of the text and replacing it with [***].