hey...is me again, i cant improve the relationship after reach 40, and i reading the comment and you said that there's a hint when talking to Yuna at the living room but i cant find it. (sorry if there is any misspelled im not good at english.)
Yeah, I feel ya, dev had a derp moment there.
Bascially: living room, talk with Yuna, give gift, chat <- this is how she gives out hints on rel 20 and 40 so far
Ps. Go running at night in the city until you meet Syn the vendor