The logical follow-up to otaku rooms? Cosplay.
https://kotaku.com/look-at-these-otaku-rooms-5429486
Out this month, The second book in the Otacool series is about worldwide cosplayers. Perhaps it will settle the East vs. West cosplay debate? Perhaps not!
https://kotaku.com/can-the-west-cosplay-with-the-best-of-them-5432053
世界24カ国のコスプレーヤー OTACOOL2発売 「クオリティ高ぇ…」 [アキバBlog]