check this mononofu guide link
http://harem-battle.club/wiki/Mononofu/Mononofu:Guide
check this mononofu guide link
http://harem-battle.club/wiki/Mononofu/Mononofu:Guide
Pretty sure you have to level up the temple to unlock harbor. It's been so long since I did it I do not remember for sure though. I know for sure you have to level the temple to 30 and 40 to unlock equipping the 2nd and 3rd artifact slots in harbor, so I think unlocking the harbor was level 20 temple.
Anyone know when there is going to be any new content added past chapter 6-4? Finally managed to clear it, and am curious when there is going to be a new hurdle to clear.