No, it's not Halloween. It's the end of December, and Japan is dressing up at Comiket, or "Comic Market", the country's biggest gathering of fan fiction, toy figures and otaku.
Sure, folks are buying self-published manga, games and photobooks, but it's really hard to overstate how big the event's cosplay ("costume play") is. Hordes of amateur cosplayers mill about the convention center, posing for photos.
Previously, Kotaku posted the first day of Comiket cosplay. Here's more, including shots of the second day's festivities.
【速報】コミケ＆となコス コスプレダイジェスト3 【コミケ79レポ】 [Moeyo.com]