The theme of this year's mystery-solving event is "The History of Art Forest." You can enjoy solving the mystery while imagining "Art Forest when it opened in 1986" and "Art Forest of the Future." Embark on a journey through time while feeling the rich expressions of the 74 sculptures amid nature that changes with the seasons!

"You started working at Art Forest in the spring and discovered a strange object floating on the water near the symbolic relief of the open-air museum."
Like a scene from a science fiction movie, the strange object projected an image into the air. A person spoke from the image, saying, "At this rate, the Art Forest will disappear. Please lend us your strength." The person also pleaded for help, saying, "The Art Forest of the Future is collapsing due to some kind of force, and while the damage is currently limited to the park, it may eventually affect the city and the world."

The strange object is a time machine that can take you to both the past and the future. It also tells you that what is happening in 2054 may be related to the events that occurred when the Art Forest opened. You set off on a journey to the past and future to find out what happened back then and save the Art Forest. On your journey through time, you learn of a "promise" and make one yourself.