Asuna and Silica belong to the same supportive circle of players and survivors.
Silica is included among Asuna's friends during later ALO activities and joins the Excalibur mission alongside her.
Kirito and Silica share a supportive party relationship within the broader Aincrad survivor group.
Silica is part of Kirito's wider party network and later joins him, Asuna, Klein, and others for the Excalibur mission.
Their clearest established connection is cooperative participation in a high-risk group quest.
Klein and Silica join the same Excalibur party with Kirito and Asuna.
Their established link is cooperative rather than personal, formed through the shared mission group.
Silica and Agil are both included in the later party network that undertakes the Excalibur mission.
Explore the full interactive character relationship map of Sword Art Online
Related entry on Wikidata (Q28022211), public domain (CC0).