Zenodo. 2026This paper fixes why within Kasei-Theory as a non-modal fixation in which reason-demand is not established as reason. This paper does not answer why. It does not provide reason, ground, cause, origin, explanation, justification, sufficient reason, first cause, foundation, answer, or regress. It does not stop regress by giving a final reason. Why is fixed only as a structural position in which the demand for reason is not established as reason. Why is not inquiry, question, problem,