Tool
There's an eye on the ground, among some fins. What happened? You killed a fish, and now you you must hide the murder tool. Quick, hide the tool before someone finds out it was you.
ぐ
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The tool is dripping with goo (ぐ). Goopy, incriminating goo. It's the guts of the fish you just killed and it's all over your hands too. Yuck.