New teacher Okada Yuu and his senior, Ms. Rumi, are on a field trip with their 16 elementary students to Sanrio Puroland. But suddenly they wander into a mysterious and horrific theme park called Yuropia! Amid their confusion, ominous Frog Egg mascots announce that the only way for them to escape is to "conquer the attractions and gather 10 medals." Will they be able to get out of Yuropia in one piece?!

(Source: Kadokawa, translated)