You've always lived in a lovely, peaceful town between a river and a mountain. Ghosts and demons hunt outside the town walls at night, but so far, they haven't been a big problem. Your town, like every town, has guards. The provincial capital is just a daytrip away. Heroes sometimes pass through in their armors and magical capes, but you're not one of those folks. You're villagers. Life is good.
Until one night, when a pack of were-tigers attacks the town. They eat the guards. They want to turn your town into a snack station for local monsters.
Someone needs to do something, and you are that someone, even if you don't have any real adventuring talents, magic weapons, or proper kong-fu training. You have pitchforks, torches, wheelbarrows, eggs, and frying pans. Maybe you can recognize some herbs, write a little, or carry a tray filled with teacups.
You, a band of simple villagers, need to get out, survive the perilous overnight trip to the provincial capital where the Emperor's troops and several heroes are stationed, and get help before it's too late. Or you can try to figure out another way to deal with the were-tigers. The main point is, you don't want monsters to eat everyone you love.
Any characters who survive the adventure become level 1 characters, ready to be brought to other games. Which class they gain depends on what they did during this adventure. If they survive.
System: Powered by the Apocalypse Engine (PBTA), Funnel World. Very easy to understand, no complex math required. What is Funnel World? "A Funnel is an adventure in which the player-characters start as a motley crew of ordinary villagers who find themselves in extraordinary circumstances; common folk thrown into a crucible of death and terror, who struggle merely to come out the other end in one piece. Many, and sometimes all of these poor souls die horrible deaths over the course of a Funnel adventure, but those lucky enough to survive are transformed by the extremity of their experience." (From Funnel World description)
You get two or three level zero characters to play, so if one dies, your game can still continue. The characters are statted and ready to go when the game starts, but not otherwise very strictly defined so you can make them yours, or even bring in your (un-powered) OCs and slot them on the premade character templates. PCs may and probably will die, so while OCs are welcome, please only bring in those whose sudden death will not send you into a sadness spiral.
Feel free to bring your own dice.