Looking back, Dark Knight (Japanese: 振り返れば暗黒騎士,Furikaereba Ankoku-kishi) is the 40th episode of the Yo-kai Watch Shadowside anime. It was broadcasted in Japan on January 25, 2019.
Natsume is comforting her game-loving classmate Nikaido, who seemingly somehow got frightened when he saw a game called "VR Records of War". As she tells everyone about Nikaido, something about "VR Records of War" is also posted onto Usuranura! Supposedly, if you win a fight against an opponent's character in this game, a knight wearing a black cloak appears, and attacks you with a sword. Natsume and the others immediately go to question Nikaido, and he did experience something similar. Since then, he's been unable to contact Shun, a college student who was his opponent at the time. Next, they try and check out Shun's apartment. The door is unlocked and ajar, and as they fearfully peak inside, the entire place turns into an arena like in a game.