Consensus building is a process of reaching a unanimous agreement through communication. In contexts such as the construction of energy-related facilities, conflicts often arise between local residents and companies or local governments, making consensus building particularly challenging. These situations involve an asymmetry of roles, with one side bearing the risks and the other seeking acceptance of those risks. However, previous experimental studies on consensus building have predominantly employed tasks based on the assumption of equal positions between participants. This study used an experimental task that incorporates asymmetric roles and conducted laboratory experiments and examined the influence of affective factors on the consensus-building process. The findings of this study suggest that specific patterns of interaction, such as the expression of empathy and sincerity following the revelation of deception, may play an important role in building trust and achieving consensus.