Based on a media franchise that started with characters created by illustrator Fuke "Huke" Ryouhei and later inspired a song of the same name by Ryo, a music Kuroi Mato just got into junior high school, and on the first day, someone catches her eye; her classmate Takanashi Yomi. The two meet. The innocent and naive Mato. The mature Yomi. Seemingly opposites, but the time they spend together only strengthens a growing friendship. But as they go into their second year at the school, they get placed in separate classes, and they begin to grow apart.But somewhere simultaneously... In another world, a young girl, blue fire residing in her eyes, Black Rock Shooter faces another young girl; this one holding a jet-black scythe, Dead Master, and a battle to the death begins to unfold.