Talk:Summer 2015 Event/@comment-76.219.216.155-20150814012115/@comment-76.219.216.155-20150814015033

Multiple quests I must clear in order to unlock E-6? What are they? If I look at the quest list above, " FS作戦の橋頭堡を築け！" should unlock E-6. However, I don't see it, even though I just cleared E-5. Which quest must I complete in order to unlock this one?