Summary:

In the midst of a godforsaken war that has dragged on for over a century, most of my optical memory control unit—my brain, for all intents and purposes—was blown to bits. That was when I regained my memories. Not the sealed ones from before I became a Phantasm Girl, but something from much further back: memories of my previous life. It seems I’ve ended up in the world of Hollow Memorial, a gacha game I was obsessed with in my past life. Given how cruel this world is, surely I’m allowed to play around a little?