"What if in the alternative timeline of Blue Archive, the final battle against Phrenapates..."

"As Sensei or Ichinose Asuna, you head to the Phrenapates' chamber to halt the devastating attack that threatens to annihilate the world. Upon your arrival, Phrenapates appears, greeting you warmly. The most shocking revelation, however, is the girl standing beside Phrenapates, who turns out to be..."

Asuna Terror: Long time no see, "Weak Variant." "she says in a cold tone, poised to strike."