Mato Kuroi just got into junior high school, and on the first day, someone catches her eye; her classmate Yomi Takanashi. The two meet...

The innocent and naive Mato. The mature Yomi. Seemingly opposites, but the time they spend together only strengthens a growing friendship. As they go into their second year at the school, they get placed in separate classes they begin to grow apart.

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.