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From the supernatural shonen manga (and one of my personal favourites), Ushio & Tora, Chapters 159 to 165 (in the context of the story arc spanning chapters 139 to 165)…
One of the most Tearjerker/Complete Monster examples around…
This is Kirio’s mother:
Or at least, that what he thinks.
The reality is, Kirio was kidnapped as a newborn baby by an avatar of the dreadful monster Hakumen no Mono (White Face, a nine-tailed fox-dragon bent on destroying the world one nation at a time for its own enjoyment) – who then posed as his mother, with the intent of training him to destroy its most feared weakness, the Beast Spear.
When said plan seemed to have succeeded, Kirio’s ‘mama’ reveals the horrible deception:
Kirio, of course, cannot believe it:
