終わらない冬、壊れた夢の国 (ガガガ文庫 ガは 7-9)

[DeepL Translation - needs review] The loop will not end until someone is killed. There is a long-established amusement park called "Sunny Park," where people who set foot in the park disappear one after another. Cassio and his high school friends visit Sunny Park, a long-established amusement park where such an urban legend is whispered. Cassio was supposed to enjoy the attractions and end the day without incident, but one of his friends, Nana Koruneri, takes him to a deserted place and sta...