Zenodo. 2026This paper fixes Fuka within the fourth system of Kasei-Theory as a non-modal fixation of non-established fixation-form. Fuka is not absence, negation, failure, limitation, contradiction, exteriority, or origin. Fuka does not designate what is missing, what is denied, what fails to appear, what lies outside readable configuration, or what remains beyond access. Fuka is fixed only where fixation-form, formation-form, return-form, application-form, and translation-form are not establ