Talk:Tokugawa Kaiten Meikyū - Ōoku/@comment-28605611-20190327063920/@comment-28209103-20190327084209

at this point LB lock requirement is not measure of difficulty anymore.

This is because it's most probably locked for story pacing reason rather than difficulty reason. As some people already speculate this LB seems to be related to SE.RA.PH and SE.RA.PH seems to be related to Yugakhsektra.

Thus if said speculation is correct we can assume this event to be an interlude before 4th Lostbelt similar to Journey to The west is an interlude related to Camelot.