Withdrawal
You use your fingers to dig through the trash in the light of the moon in winter because somewhere in there is your withdrawal letter. What did you withdraw? Your resignation? Your troops? Whatever it was, you need to find the proof, and fast.
Imagine you need proof of your withdrawal so badly, that you're in the trash like this, raking around with your fingers in the moonlight. Close your eyes and feel the cold, smell the stink.
てつ
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While looking for the withdrawal letter, your fingers hit a piece of 鉄 (てつ). Ouch!
The pain from the 鉄 reverberates up your fingers and into your hands and arms. What's this great lump of 鉄 doing in the trash?