This, being one of the DarkerAndEdgier incarnations of Franchise/KamenRider, has a fair amount of NightmareFuel.

* The first episode ''[[EstablishingSeriesMoment begins]]'' with some kind of laboratory experiment... and then some kind of monster from outside the building forces its way through security, killing without discrimination, and the (apparently thick and heavy) door to where the scientists are doesn't hold up very long. We don't really get to ''see'' the monster itself, either, which only [[NothingIsScarier makes it worse]].
* Also, around episode 5, after Faiz defeats the MonsterOfTheWeek at the end of the episode, it comes back in human form to give Yuji and Yuka a warning, and then bursts into blue flame. The worst part is that there's a brief shot of the ''half-burned'' corpse, including his now deformed face and partially exposed (blue) skull. [[{{Squick}} Ugh...]]
* In one of the early episodes, Yuka is harassed by some [[TeensAreMonsters incredibly cruel]] girls. Normally, this wouldn't be enough for NightmareFuel... except that most of it is just offscreen, and the circumstances make it sound and feel as if she's being ''raped''.
** Then there's Yuka's retaliation once she discovers her monster form. Also offscreen, but filled with the screams of those very same women as the swan molts everywhere.
* Orphenoch victims. After being savagely attacked by a monster, they will stand up apparently just fine, act either a little confused or ''perfectly normal as if nothing happened'' for a few seconds, and then slowly crumble to dust, which they ''may or may not notice happening.''