KanColle Kai talk:Quests/@comment-24977802-20160227115207

The quest to unlock 6th fleet doesn't need the myoukou sisters, I unlocked the quest for it after clearing the Sendai-class Composition quest

Which is 北方海峡の警護を実施せよ！ ( Get 3 S ranks in  北方海峡(Northeast of home base - 2) boss )

and after clearing it, it unlocks

オリョール海西部に進出せよ！(Get S rank in orel boss )