The Hero defeated the Demon King, and yet at the same, he became someone who would never return home.
Four years have passed since the Demon King's defeat. To honor the deceased Hero, the now-at-peace Kingdom launches a project to compile his many achievements. The Hero's former companions, the Knight Leon, the Saint Maria, and the Sage Solon, are interviewed. All of them are unclear about the truth behind the Hero's death. Why did the Hero die? Was it the Demon King who killed him, or his companions?
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The title is a reference to [Who Killed Cock Robin?](https://en.wikipedia.org/wiki/Cock_Robin).
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**Character Design:** [toi8](https://mangadex.org/author/eef8ef8e-a7f5-48a0-83cb-608a09790a37/toi8)
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