Polish
Below this canopy of trees is a stone. Since it's the only stone here, you make sure to polish it.
It's a single, perfectly round stone under this canopy of trees. It didn't start this way, but thanks to all the polishing you did, it has become nice and smooth.
ま
みが
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You polish the stone due to your meager (みが) lifestyle.
There's only this one stone under these trees, and polishing the stone is the only job here. Still, you don't get much from it, thus the meager life of polishing your stone.