Nodoka Kishin

A mysterious transfer student who moves in next door to Riku. After befriending Riku, she is invited out to a gathering where she mentions a rumor from her previous school called the "Die Any Day" videos.

After eating lunch with Riku, Riko and Haju, she is killed in a seemingly freak accident.

it is revealed soon after that Kishin seemed to be involved in the same "Die Any Day" videos she mentioned to the trio.