The goal is to present 'tsui' not as a list of words, but as a conceptual operating system.

This study aims to reconstruct the Japanese concept of ``tsui'' (対)---paired opposites---as a universal set of conceptual axes. While Japanese contains an exceptionally rich inventory of lexical pairs, these pairs have rarely been organized systematically or examined as a coherent cognitive structure. To address this gap, approximately one thousand Japanese tsui were collected and then consolidated through the removal of lexical duplicates, structural redundancies, and near-synonymous variants. This process yielded 277 core axes. Next, culturally specific pairs that cannot be translated naturally into English (e.g., ``honne/tatemae'') were excluded, and pairs that collapse into the same English expression (e.g., multiple forms of ``rise/fall'' or ``dense/sparse'') were unified. Through this refinement, a final set of approximately 230--240 universal conceptual pairs was extracted. These pairs span fifteen domains, including space, time, quantity, sensation, emotion, society, nature, life, action, thought, structure, economy, and technology. The resulting set functions as a conceptual operating system: a minimal relational framework that captures how humans perceive, categorize, and interpret the world. This work provides a foundation for applications in cognitive science, linguistics, philosophy, artificial intelligence, and cross-cultural education.