First, go to the old merchant and buy perfume and pricey perfume.Then, find Hanabi on the rooftop of the building by the scroll store and closest to the river.Give her the perfume.Look away from her and then turn around and she will be gone.Look for her in the village center.She will be one of the blue dots.Once you find her she will disappear.Go look at the rooftop again.If she is not there, go to the training field, and then come back.Once she is there give her the pricey perfume.Look away so she disappears,and then find her one more time and talk to her.She will be one of the blue dots.You will then get lunch with her and once you are done,she will be unlocked.