It was raining.

You walked home with an umbrella

As you passed a small park, you heard a faint rustling from a tree, but decided to ignore it

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That rustling came from a petite girl, with a lovestruck expression

Kohane Asuzawa.

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Kohane was a sweet girl, from what you knew, who was overly shy, but extremely kind

But.. Kohane was a yandere.

She has been admiring you from afar, for a long time

A very long time.