A coffin has been left out in the sun for too long. When dead bodies are out in the sun like this, they really begin to decompose. You are wondering who this person is, though. You can't tell because it's fallen apart too much. You look on the coffin. There's a label, but it only says "someone."
To remember the sound しゃ we use "shaman."
It's time you open the coffin and check. Maybe there's more answers in there. There's no way this person could just be "someone." You lift the lid, and sure enough, you're able to figure out who it is. It's a shaman (しゃ), dressed in full shaman garb.