|What's Red, But Isn't Red?|
|Romaji Title||Akai no ni, Akakunai no wa?|
|English Title||What's Red, But Isn't Red?|
|Airdate||April 17, 2014|
|Opening||Soushou Innocence by Maaya Uchida|
|Ending||Concentration by Manami Numakura as Otoya Takechi|
|Previous Episode||Episode 2|
|Next Episode||Episode 4|
What's Red, But Isn't Red? (赤いのに赤くないのは?; Akai no ni, Akakunai no wa?) is the third episode of the Akuma no Riddle anime series and was released on April 17th, 2014.
The next day, Haru receives an advance warning that her life is being targeted and decides not to inform Tokaku, becoming determined to defend herself. Later, as the Black Class visits a botanical garden, Haru is befriended by Otoya Takechi, unaware that she is the one who sent the warning. Later that night, Tokaku warns Haru not to be so naive and explains the rules concerning her assassination, but Haru states her hope that the other assassins could legitimately become her friends and none will have to die.
The next day, Otoya pretends to thank Haru for giving her a friendship strap and she decides to give Haru a return gift.She gives her flowers which Haru accepts happily. Otoya later reveals that the flowers she gave contained powerful neurotoxins, before trapping Tokaku in a boiler room so that she cannot interfere. Tokaku manages to escape and learns that it wasn't Shiena Kenmochi who sent the advance warning and that it was Otoya. She also learned from the others that Otoya, was a serial killer who gets sexual pleasure from killing her victims.
As Tokaku manages to reach their location and fight against Otoya, she is almost killed but is saved when Haru uses the same flowers to knock Otoya unconscious. With her 48 hour time limit up come the next morning, Otoya is 'transferred' out of the Black Class by the group's ringleader, Nio Hashiri.