Romantic Killer, Vol. 1 by Wataru Momose

[Viz] The full-color manga that inspired the anime series! High schooler Anzu Hoshino has a great life. Every day she plays video games, pigs out on snacks, and pets her beloved cat. But this blissful existence is turned into a confusing mess when a magical creature transports her to an altered reality bereft of her favorite things. Now she’s stuck with hot guys instead! How can she possibly survive in such an awful world?! Anzu must play along in this altered reality before she can return to her normal life, so she begrudgingly makes friends with Tsukasa Kazuki. He unfortunately happens to be one of the hottest and most popular guys at school, and what’s worse, she realizes that he might not even be that bad of a person!