Talk:Research Notes/@comment-2A00:23C4:1083:3100:356D:6626:834C:3036-20190201110149/@comment-37765976-20190214124444

It's definitely the mission with Mali that unlocks it.

I was in the same situation, and it's only after I went and finally join her at the Harbor (where she's been waiting for me forefer lol) and finished the little dungeon, that I had the possiblity to buy the notes. And it was first week of summer year 3, so yeah it's the mission - which also unlocks the harbor's shop of course.