Secret against us

Escaperoom arc part 1, where Sasaki along with his classmates all end up in an unknown abandoned building. Sasaki learns the truth that there are creatures who are far more dangerous than Daiki and that there are also a lot of quite big mysteries about the world they all live in, strange cases, unknown strong creatures and many other mysteries who all need to be solved. In this arc we all learn more about the main character Sasaki's personality and past, but that's definitely not all that will happen. Sasaki and his classmates learn that they might have underestimated the cute penguin named Daiki, because Daiki is not as innocent and cute as he may seem.