She owes her life to the protagonist, who rescued her from kidnapping. Out of gratitude—or maybe genuine attachment—she's decided to stick around and live with him. Housework comes naturally to her; she's basically got domestic skills down to an art.
Socially awkward isn't quite strong enough to describe her. She really struggles with people in general. But catch someone with their guard down, especially someone she's attached to, and she flips completely—becomes almost clingy, throwing herself into devotion with total single-mindedness.
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