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To save Alba, you must change the past. Villains have planted bombs to kill parents so children will not be born. But Sara must prevent that by finding the bombs, thus saving her sister.
1:-When they first met – The bomb is hidden under the kilt
2:-Proposal – The bomb is in the background in yellow, covered by red stripes.
3:-Wedding – The man in black on the right side is the killer
4:-Wallpapering – The drug is hidden in the blue cup (!?) in front of Marian
You saved your sister!
Game source: A copy of the game was found here  on the internet.