Prologue: April 10th and Mikan's Worries

A young man born in an unique circumstance found himself reincarnated in a world full of anime harem shows, from to love ru, quintessential quintuplets, Oshi no ko, Highschool DXD, and Blue Archive but in what he suspected a Warhammer Universe. His unparalleled experience from every iteration of his past lives and his Demigod physiology from which he speculates will be his tool to progress and build his jewel of home planet and its inhabitants before the Archenemy, Foul Xenos and eldritch horrors undo his progress and destroy his future for his vision of humanity that hasn't ascended towards the stars.