Far
You see a scooter with a zombie on it, going really far away. Someone tied that zombie to the scooter and now it's far off in the distance, groaning and growling.
Picture the zombie, going far off into the distance. It's getting smaller and harder to see.
えん
とお
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The zombie goes so far, that its life ends (えん). Zombies need to eat to live (it's really all they need), but they go so far on their scooter trip, that they just give up and end it all.
I mean, to be fair, the zombie wasn't really alive to begin with. But going far enough to end it all? That's some serious distance!