Strange Babies

Sequel to the oneshot story "Black Yagi to Gekiyaku Madeleine" included in the anthology of the same name. Yagi and Madeline are finally together after confessing to each other on a live broadcast. They're now a modern internet celebrity couple that shares their love both on screen and off it, but who is the person who left a message in Yagi's locker warning her to meet them after school?