Multicultural and inclusive education require more than the physical co-presence of diverse learners; they require repeated practices that make recognition, dialogue, belonging, and equitable participation visible in everyday school life. This qualitative single-case study examined how Kula Babong, a Sikka deliberative tradition associated with sitting together, respectful exchange, kinship, and collective agreement, was translated into educational practice at SMP Muhammadiyah Waipare, Sikka, Indonesia. The bounded case involved 16 participants: one principal, three teachers, eight students without identified special educational needs (SEN), and four students with SEN. Evidence comprised 16 individual interviews, two small-group interview sessions, eight non-participant observations conducted over four weeks (approximately 10 hours), and 12 documentary items. Analysis followed data condensation, cross-source display, and conclusion drawing/verification, with interview, observation, and documentary evidence compared for convergence and contradiction. Three primary translation pathways were identified: curriculum and learning, school culture and religious accommodation, and leadership/teacher modeling, with peer interaction operating across all three. Students generally articulated that difference should not justify exclusion; however, enacted participation was less uniform, as some students with SEN were described or observed as showing discomfort or withdrawal, and occasional insensitive jokes or minor verbal bullying were reported outside direct supervision. Leadership commitment, cultural familiarity, and religious openness supported implementation, whereas limited in-school specialist capacity, learning and communication barriers, negative peer behavior, and family economic or geographic constraints restricted it. Kula Babong is therefore best understood as a culturally grounded interpretive and pedagogical resource rather than a standalone causal mechanism.