Social skills refer to the ability to manage verbal and nonverbal behaviors during interactions with one or more individuals. People who struggle with social interactions often find it challenging to accurately grasp their own social behaviors and understand how others perceive them. Social Skills Training (SST), typically conducted by clinical psychologists or psychiatrists, aims to enhance social interactions and reduce social stress. In addition to traditional SST, we also explore cognitive-behavioral therapy (CBT), a psychiatric approach that improves cognitive abilities and alleviates symptoms such as anxiety and depression stemming from a lack of social skills. To implement these methods in practice, we design conversational virtual agents capable of taking on various roles and scenarios. This research project, initiated in October 2019, is part of a Japan-France international joint ANR-CREST research initiative.