Black Black Lotus

Renna, a new student at Fuyou Girls School, meets Kyouko, known as "Black Rose" and admired by others. Kyouko is enigmatic and appears familiar with Renna, mentioning that her voice drew her in and that she once saved her during elementary school. This triggers a memory for Renna about why she changed schools and relocated four years prior—something she had repressed for self-protection. Renna is shocked to learn that Black Rose is dead and realizes she was meant to meet her on the day of her murder. After receiving a black card inviting her to "Black Black Lotus," an online platform for murder matches, Renna discovers that someone using her name was responsible for Kyouko’s death.