It has been suggested that social withdrawal (NEET/Hikikomori behaviour) occurs as a result of an individual’s difficulty to adapt to social norms and pressures within given cultures (marginalisation), and is present in collectivistic cultures with high social pressures and expectations. Since most of the NEET/Hikikomori studies have been conducted in Japan, we examine its applicability in Singapore with the NEET/Hikikomori Risk scale. We collected data from university students, and were able to confirm its convergent validity. To better understand its social and psychological context, we conducted an exploratory analysis to find associations with perceived deficits in social relationships, self-esteem and competence, as well as personality, anxiety, depression, and cultural self-construal. Consistent with previous findings in Japan, the evidence supports the risks of NEET/Hikikomori tendencies in Singapore as concurrent with cultural marginalisation, perceived social rejection and low views of self.