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Nightmare Fuel: Log Horizon
Episode 19: Minori shows off the Full Control Encounter she copied off Shiroe and how she can effectively see five seconds into the future because of it. While this is initially awesome, it takes a darker turn when the direwolves show up. Full Control Encounter tells her that her brother will die because the wolves reduce his HP faster than they can restore it, and without their tank, the rest of them will die, and without them, the town of Chousin will be ravaged. There's this terrible Slow Motion scene where she's desperately trying to find a way out of a tragedy five seconds in coming and comes up with nothing; dead end, game over.
Episode 25: Shiroe's encounter with Nureha. He was supposed to meet with one of his contacts that was spying for him in the city of Minami, but finds the disguised Nureha. She implies that Shiroe's contact was unavailable to meet him...and given that Nureha is a guild master that runs an entire town and bought the Cathedral, potentially forbidding any Adventurers from reviving if she chooses, the implications are very dark. Darker still are Nureha's intentions. Even in the anime version where sexual tones and fanservice are heavily downplayed from the light novel, Nureha still expresses copious levels of seduction and danger.
Soujirou is not someone you want to be in the same room with when he's angry. Case in point, his attitude towards the Serial Killer. The formerly cute kid looks like a psychopath as he plots to take him down. It's a good thing he's a good guy, because he would make a terrifying villain.