Honoka

Honoka was a former classmate and friend of Shuichi Kagaya and Elena Aoki who is responsible for the Coin Hunt game. After being revived by Kaito, she becomes a dangerous abomination/horror, therefore she is one of the main antagonists in the series.

Powers & Abilities
After Aiko's death, Honoka wished to take on Aiko's appearance so that no one would notice that Aiko had committed suicide. After being revived by Kaito, she becomes a luminescent female figure with inhuman force who can disappear any person who cannot answer her "who is she".

Naoto
Honoka since her early childhood days, had a crush on Naoto to a certain obsessive degree that, after Aiko's death she poses as her and tries to get closer to him. but regrets it later on.

Aiko
Aiko was Honoka's best friend.

Trivia

 * Not only is Honoka responsible for the Coin Hunt game, but she is also the one who convinced the Alien to offer a wish or reward in exchange for the coins. This means she is the direct cause of all the bad and evil things that happened in the series, even though her motives were originally good and pure.