- Angel/Devil Shipping: Shion and Nezumi, with no points guessing who's what.
- Awesome Music: The ending song, Rokutousei no Yoru is really heartwarming. Meguriai, the song used in the trailer is also very beautiful.
- Cliché Storm: Mostly to the Dystopia genre.
- Die for Our Ship: Fangirls tend to despise Safu for this reason. However, there has been backlash against that recently. Especially since the light novel explicitly states that even if Nezumi wasn't in the picture, Shion still wouldn't have romantic feelings for her.
- Fanon: Fanart of Shion's "snake" scar spreading onto his arms and both legs is common, but it in fact only goes from his cheek (or neck in the novels) to his left ankle in a spiral.
- LGBT Fanbase: The series has a substantial queer fanbase for being a work featuring male romance outside of the Yaoi Genre.
- Memetic Mutation:
- Moe: Shion, Shion, Shion. Especially after his hair turns white.
- Moral Event Horizon: Episode 10, the guard Shion killed crossed it when he murdered one of his own men for failing to capture Nezumi and for getting taken as a hostage instead. He planned to kill Nezumi next.
- Shocking Swerve: Two words: Forest Folk. Worse in the anime where cut material meant that nothing was done with this twist.
- Tastes Like Diabetes: Shion can be a bit too saccharine and innocent at times, though many see that as part of his charm.
- Tear Jerker:
- Shion calling out in vain to his mother as the police car he's being held in passes by her.
- Throughout episode 10, Shion begins to shed his Pollyanna status and become more hard-hearted, no longer crumbling at the deaths around him. Nezumi displays a veritable laundry list of heartbreaking expressions as he realizes this...ending in a full fledged breakdown when Shion coldly shoots a guard.
- You better believe there wasn't a dry eye in the house when Shion is shot in the final episode. Nezumi is so distraught that he literally crawls to Shion's body. After he covers him with his jacket, he lays down next to him and waits for the building to come down.
- The Woobie: Poor Shion was stripped of his status as an elite when he was a kid, just for helping another kid. When it looked like he'd pulled his life back together and was living happily, he wound up simply being in the wrong place at the wrong time and torn away from the people he loves.
- In the original novel, it was clearer that Yoming wanted revenge and was willing to screw over people to get it. In the anime, just what the hell did Yoming do to deserve dying an embarrassing death in the finale? All he wanted was justice and start an insurrection on the city that took his family away.
YMMV / No. 6