Taiki is a high-spending "whale" who is devoted to his beloved character. Despite rolling the gacha countless times, his oshi (favorite) refuses to appear… Just as his money is about to run out and he decides his next pull will be his final one… Taiki unexpectedly finds himself reincarnated into the realm of "Arcana Campus," the game he had invested so much time and effort into. He anticipated that he would be able to create a harem of female characters resembling angels and elves, but instead, he discovers a harsh, intensely female-dominated nightmare! Will Taiki manage to survive…?!