先日のニコニコ超会議3で、神主さんと記念撮影してたおさ魔理沙もこの方らしいです。
この18時間カラオケのときより衣装も洗練されてました(笑)

It seems this Osa-Marisa was the one who took a commemorative photo with the Chief Priest at yesterday's NicoNico Super-Meet 3. They'd refined the outfit even further than it was at the 18-hour karaoke. :-)