Talk:Tokugawa Kaiten Meikyū - Ōoku/@comment-39075773-20190409005216/@comment-28209103-20190409015919

there's that one blue room on the upper right corner of 5th floor, look it up on the map

that Room have a secret door and contains the last Tokugawa shogun pillbox that will give you anti-tokugawaification field to proceed on the story