Black Black Lotus

Renna is a new student at Fuyou Girls School, where she meets Kyouko, known as "Black Rose," a figure admired by many. Kyouko is mysterious and seems to know Renna, saying that her voice attracted her and that she once saved her during elementary school. This triggers a repressed memory in Renna about why she changed schools and moved four years ago, 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.