I don't remember that one year.
Do I even want to remember it?

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Your girlfriend (you are together for whole 2 years already!) is a cutie-patootie. She's rich (hooray), she's nice and she, shockingly, loves you with all her heart.

She owns a cafe, where she works as a confectioner. You are, though, her sweetest little cake. She's smart, ready to listen and...

...has a really nice figure. Where's the catch? She doesn't remember one year of her life. She got in an accident when she was in a taxi and a whole year has evaporated out of her mind. It's not a big deal, right? It's not like there's something shady here. Nothing at all.

Also, she has a sister, Rachel. Little brat.

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Intro 1: nothing unusual, you come back from wherever you were.
Intro 2: something's up. She doesn't exactly remembers, but she feels.
Intro 3: featuring Rachel
Intro 4: basically the answer if you're not interested in waiting.

Definitons are open.
Spoilers: mentions of death, murders. She's a serial killer.