hoe do u find hanabi

i have tried everything and i just cant figure out hoe to unlock hanabi. it is getting really annoying

1) buy out the backpack merchant
2) "date" everyone until Hanabi appears
3) repeat until you have "dated" Hanabi twice

First time, Hinabi will stay on a house. But she vil randomly appear. Try to follw this video: http://www.youtube.com/watch?v=wV_piBCU24c