I don't know, the book isn't that bad. Actually, the idea of the dimensional gate and the character cards are unique, she could use their ability and get possessed by them, but she can still retain her own personality. However, as the story goes on, it became boring, the MC doesn't really have a fixed goal, she's a slated fish who wants to be low-key popular, like any other normal student dreams to be. Though, I think her normal personality is what makes it boring, though there's indeed some interesting parts of the story, I can't help but feel that it's lacking something. Her personality is complicated, it had the vanity of a youth when she's daydreaming and the laid back personality that every student want to enjoy, but it's really lacking since she doesn't have a goal that she wanted to take. She just go along with the flow and I think it's boring. Sure, living her life would be amazing, but it's not suitable for a story.
