This is the data set for the study "Diminished Positive Affect in Social Anhedonia: Linking Anticipation and Experience During Dyadic Interaction" by Marcel Riehle, Jasmin Cromme, Jasmina Rahnavard, Lili Tietgens, and Hannah Allmandinger. Beside basic demographics, the data set contains data of 100 young adults (18-29 years of age), who interacted in k = 50 dyadic affiliative interactions. Data are available for measures on suspiciousness, social interaction anxiety, social anhedonia, affective forecasting before the interaction, affective experience during the interaction, perceived affect in the interaction partner, and motivation and volition to reparticipate.