瀬戸美夜子(アイドル衣装) 瀬戸美夜子(5万人記念衣装)
The fourth [[official alternate costume|costume]] of [[Nijisanji]]'s [[Seto Miyako]], as seen on "Twitter":[https://twitter.com/seto_miyako/status/1332778454119550976].
seto miyako (4th costume)