Rakuten Viki is the premier platform for Asian drama fans, featuring subtitled K-dramas, C-dramas, and Japanese shows. Content licensing varies significantly by country, making a VPN essential for accessing the full catalog. The reason for this is structural: streaming services license content country by country, and Rakuten Viki's catalogue in each market reflects whichever distribution deals were signed there. A title that's available on Rakuten Viki in the US might be on a competitor's platform in the UK, or vice versa.
A VPN sidesteps the geography problem entirely. Rakuten Viki sees the IP of GhostShield's exit server, not your real one, and serves you the catalogue for that exit region. The streaming app makes no distinction between a 'real' local user and a VPN-connected one as long as the traffic looks like residential broadband — which is exactly what WireGuard with ChaCha20-Poly1305 over GhostShield's network produces.
What you can't do is bend the laws of physics: a stream from Rakuten Viki's origin servers will always have more latency from far away. Pick the GhostShield server closest to Rakuten Viki's data centres in the region you want, not the one closest to you.