[This story is an expansion of the song Jun Maeda x Yanaginagi - Invincible Soldier. It contains a large amount of original material.]
On a terminal planet on the verge of collapse, a gigantic library remained, as intact as if by divine miracle.
There, Stepan Ivan Lermontov found relics of the world that had passed away and wrote reading notes about them.
This volume is about a brave and invincible girl.
Theme: Stepan Ivan Lermontov's first notebook.
I seem to have discovered a treasure.