Translation
The following is an English translation of an independent assurance report prepared in Japanese and is for information andreference purposes only. In the event of a discrepancy between the Japanese and English versions, the Japanese version willprevail.

Independent practitioner’s assurance report
TO:Mr. Yo Kozuki
President & CEO
S.T. CORPORATION
Scope
We have been engaged by S.T. CORPORATION (hereafter the “Company”) to perform a‘limited assurance engagement,’ as defined by International Standards on Assurance
Engagements, here after referred to as the engagement, on the Company’s environment dataand indices (the “Subject Matter”) contained in Environmental Data of Environment ofSustainability in the Company’s website (hereafter the “WEB information”) for the period fromApril 1, 2023 to March 31, 2024.The scope of our assurance procedures was limited to theSubject Matters marked with the symbol “✔” in the Report.
Criteria applied by the Company
In preparing the Subject Matter, the Company applied the Criteria, that it determined withconsideration of laws and regulations applicable to the Company as presented on the List of
calculation standards of Environment of Sustainability in the Company’s website
The Company’s responsibilities
The Company’s management is responsible for selecting the Criteria, and for presenting theSubject Matter in accordance with that Criteria, in all material respects. This responsibility
includes establishing and maintaining internal controls, maintaining adequate records andmaking estimates that are relevant to the preparation of the subject matter, such that it is freefrom material misstatement, whether due to fraud or error. Greenhouse gas (GHG) emissions
are estimated using emissions factors, and the scientific knowledge on which such emission
factors are based has not been established. GHG quantification is subject to inherent
uncertainty.
EY’s responsibilities
Our responsibility is to express a conclusion on the presentation of the Subject Matter based onthe evidence we have obtained.
We conducted our engagement in accordance with the International Standard for Assurance
Engagements Other Than Audits or Reviews of Historical Financial Information (‘ISAE 3000(Revised)’) and with respect to GHG emissions, the International Standard on Assurance
Engagements: Assurance Engagements on Greenhouse Gas Statements (“ISAE 3410”), issuedby the International Auditing and Assurance Standards Board, and the terms of reference forthis engagement as agreed with the Company on January 29, 2024. Those standards requirethat we plan and perform our engagement to express a conclusion on whether we are aware ofany material modifications that need to be made to the Subject Matter in order for it to be inaccordance with the Criteria, and to issue a report. The nature, timing, and extent of the1procedures selected depend on our judgment, including an assessment of the risk of material
misstatement, whether due to fraud or error.
We believe that the evidence obtained is sufficient and appropriate to provide a basis for ourlimited assurance conclusions.
Our independence and quality management
We have maintained our independence and confirm that we have met the requirements of theCode of Ethics for Professional Accountants issued by the International Ethics Standards Board
for Accountants and have the required competencies and experience to conduct this assurance
engagement.
EY also applies International Standard on Quality Management 1, Quality Management for
Firms that Perform Audits or Reviews of Financial Statements, or Other Assurance or Related
Services engagements, which requires that we design, implement and operate a system of
quality management including policies or procedures regarding compliance with ethicalrequirements, professional standards and applicable legal and regulatory requirements.
Description of procedures performed
Procedures performed in a limited assurance engagement vary in nature and timing from, andare less in extent than for a reasonable assurance engagement. Consequently, the level ofassurance obtained in a limited assurance engagement is substantially lower than theassurance that would have been obtained had a reasonable assurance engagement been
performed. Our procedures were designed to obtain a limited level of assurance on which tobase our conclusion and do not provide all the evidence that would be required to provide a
reasonable level of assurance.
Although we considered the effectiveness of management’s internal controls when determining
the nature and extent of our procedures, our assurance engagement was not designed toprovide assurance on internal controls. Our procedures did not include testing controls or
performing procedures relating to checking aggregation or calculation of data within IT systems.
A limited assurance engagement consists of making enquiries, primarily of persons responsible
for preparing the Subject Matter and related information, and applying analytical and otherappropriate procedures.
Our procedures included:

・ Making enquiries regarding the Company’s own criteria that it determined withconsideration of laws and regulations applicable to the Company, and evaluating theappropriateness thereof;・ Inspecting relevant documents with regard to the design of the Company’s internal
controls related to the Subject Matter, and enquiring of personnel responsible thereof at
the Company and site visited (S.T.MYCOAL CO.,LTD);

・ Performing analytical procedures concerning the Subject Matter at the Company andsite visited (S.T.MYCOAL CO.,LTD); and2

・ Testing, on a sample basis, underlying source information, matching indicators with theevidence and conducting relevant re-calculations at the Company and site visited(S.T.MYCOAL CO.,LTD ).
We also performed such other procedures as we considered necessary in the circumstances.
Conclusion
Based on our procedures and the evidence obtained, we are not aware of any material
modifications that should be made to the Subject Matter for the period from April 1, 2023 toMarch 31, 2024 in order for it to be in accordance with the Criteria.

Kenji Sawami
Engagement Partners
Yuichiro Tamaki
Engagement Partners
July 31, 2024
Ernst & Young ShinNihon LLC
Tokyo, Japan3