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EXHIBIT 12.1

CERTIFICATION
Pursuant to Section 302 of the
Sarbanes-Oxley Act 2002

I, Kazuhiko Muraki, certify that:



|1. |  | I have reviewed this Annual Report on Form
20-F of Crayfish Co., Ltd.
(Crayfish)
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|2. |  | Based on my knowledge, this report does not
contain any untrue statement
of fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made,
not misleading with respect to the period covered by this report;
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|3. |  | Based on my knowledge, the financial statements, and other financial
information included in this Annual Report, fairly presenting all material
respects the financial condition, results of operations and cash flows of
Crayfish as of, and for the periods presented in this Annual Report;
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|4. |  | The companys other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e)) for the company and have:
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| | (a) |  | Designed such disclosure controls and procedures, or caused
such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to
Crayfish, including its consolidated subsidiary, is made known to us
by others within those entities, particularly during the period in
which this Annual Report is being prepared;
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| | (b) |  | Evaluated the effectiveness of Crayfishs disclosure controls
and procedures and presented in this Annual Report our conclusions
about the effectiveness of the disclosure controls and procedures,
as of the end of the period covered by this Annual Report based on
such evaluation; and
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| | (c) |  | Disclosed in this Annual Report any change in Crayfishs
internal control over financial reporting that occurred during the
period covered by the Annual Report that has materially affected
Crayfishs internal control over financial reporting.
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|5. |  | The companys other certifying officer(s) and I have disclosed, based on
our most recent evaluation of internal control over financial reporting,
to the companys auditors and the audit committee of the companys board
of directors (or persons performing the equivalent function):
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| | (a) |  | All significant deficiencies and material weaknesses in the
design or operation of internal control over financial reporting
which are reasonably likely to adversely affect Crayfishs ability
to record, process, summarize and report financial information; and
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| | (b) |  | Any fraud, whether or not material, that involves management
or other employees who have a significant role in Crayfishs
internal control over financial reporting.
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/s/ Kazuhiko Muraki
Kazuhiko Muraki
President and Representative DirectorDate: March 10, 2004