Kamen Rider Horrible Wings

Let me tell you a story about demons, eternity, darkness and light... At an unknown time that has long been forgotten, a wizard created a set of masks using a mysterious gem called "Azot". They are called "Evil Masks". These masks can give people evil hearts and terrifying powers. Even in evil ancient books in the supernatural realm, these terrifying things are only mentioned vaguely. They are described as "a devil's contract that can swallow people's hearts, help extremely evil people enter the palace of eternity, and become immortal." Its existence was never acknowledged, and therefore it was gradually forgotten. In 1999, an exploration of the Demon Cave, a large ancient ruin in Yuemue City, caused a team of archaeologists to disappear inside, and the Demon Cave collapsed after they lost contact. After that, a strange mask spread on the market and was passed on from person to person. Those who wear the mask will turn into terrifying monsters, and rumors of attacking humans gradually begin to spread among the crowd. Undercurrents are surging, and people put on masks for selfish desires or out of necessity, and join this "masquerade".