As Mato breaks down from what she had just done, Black Rock Shooter transforms into Insane Black Rock Shooter and stands against Black Gold Saw. As Black Rock Shooter rips off her own arm to fight against Black Gold Saw, Mato passes out from the pain, preventing Yuu from calling her back to her body. She brings her to Saya, who wanted to prevent Black Rock Shooter from causing destruction in the other world, but can't bring herself to kill Mato in order to do so. Instead, Saya transport her mind to Black Gold Saw's so she can try to reach Mato. Saya talks about how she befriended Yuu, who had been constantly bullied at both home and school. One night, when Yuu's house caught fire, Saya wrongly assumed Yuu was responsible and felt guilty. When Saya found her the next day, she asked Saya to protect her and awakened her connection to Black Gold Saw. Back in the present, Strength steps in to fight Black Rock Shooter in Black Gold Saw's place, allowing Saya to return. As Strength overwhelms Black Rock Shooter in battle, Yomi returns to school with no apparent memory of Mato.
On the first day of junior high school, Mato Kuroi happens to run into Yomi Takanashi, a shy, withdrawn girl whom she immediately takes an interest in. Mato tries her best to make conversation with Yomi, wanting to befriend her. At first, she is avoided, but the ice breaks when Yomi happens to notice a decorative blue bird attached to Mato's phone, which is from the book "Li'l Birds At Play." Discovering they have a common interest, the two form a strong friendship.
In an alternate universe, the young girls exist as parallel beings, Mato as Black★Rock Shooter, and Yomi as Dead Master. Somehow, what happens in one world seems to have an effect on the other, and unaware of this fact, the girls unknowingly become entangled by the threads of fate.
