No; going with a lawyer is strongly recommended. The assistance of defence counsel is a fundamental right under the Criminal Procedure Code (No. 5271), which also guarantees the right to remain silent and the right to be told what you are accused of. In economic crime and corporate matters the first statement largely determines how the file develops: even a technical accounting or contractual concept explained incorrectly or incompletely can be read against you later.
Your lawyer works through the file and the likely questions with you beforehand, objects to procedural irregularities during the statement itself, and checks that what goes into the record is accurate. Always prepare with your lawyer before giving a statement, and rather than guessing at an answer on something you are unsure of, use the right to consult that you have. In short: not without a lawyer, but prepared and with counsel present.
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