Serena is a character in the Wii video game Animal Crossing: City Folk. Visit the town hall and donate enough Bells to your town fund to have a fountain built in town. once the constructions complete (and Tortimer moves out of your way), toss an axe into the fountain to summon a mystical character named Serena. Answer Serena's questions for a chance at scoring either a silver or gold axe, which won't break.
Serena on Fountain

Serena talking to a player.

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