I am in affection level 3 with Luka, but some CG still lock as the one that needs to reach level 1, so I don't understand what I really need to do. Also once appeared a date to unlock one special CG (the one that only needs to go to the date map) but I chose a wrong answer and I don't know how to repeat it or if it appear randomly, I need help :( I am new in the game
The event that appears once in a while to unlock a special CG is given on random. You cannot choose when it will appear. The best way for it to appear is just keep on dating (as far as I know).
The LOVE CG with the puzzle looking thing is different though. You need to buy those clues in Love Shop ORR get them randomly from Love Wheel when you spin it.
Hope this sorta helps!