Botsuneta-dōri no Kimitoboku

This visual novel follows a protagonist who finds themselves transported into the literary world of an author who plans to end his series. After meeting Botsuko, a girl from that world who realizes the world around them is about to come to a close, they set out together to try to find a way to save it. Its story is told via shifting art styles that evoke the concept of a fictional world in the middle of its creation.