The Owner of Hell's Tower

It was a normal day where everything was normal. The grass was normal, the trees were normal, the building were normal, the disappearance of 2.3 billion people and the appearance of giant spires all across the world was normal. WAIT WHAT!? Read as our main character, Sapphire Crystal, escapes hell in Hell's Tower, after billions of people are given the prompt: [Hello! Please select a difficulty] [EASY] [MEDIUM] [HARD] [HELL] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This book will contain: violence, swears, an overpowered MC, and Yuri content. So if you don't like that kinda stuff then get out of here.