The title is somewhat misleading, so let me make this clear from the start: this book contains no youthful romance. It is solely about two girls fighting to the death.
Although Kinoshita Yuno and Sakurajima Mai appear in this work, they are not the actual characters, nor are they corrupted. They are merely "images" made from fragments of their personalities, so fans of the original works, please don't take offense.
This is... a showdown between two "images."
This is a short story and will not be published as a paid work. Although the characters are single, as their portrayals develop, yuri elements may naturally emerge. Or they may not.
Dark, plot-driven, and serious in tone. If that's not your thing, please don't read.