12 men and women who participated in the actor workshop will face "why they act". A unique ensemble drama that combines the absurd sci-fi horror of the subject film with the documentary part.

With a "Mazui Bar" snack in hand, Choshi Electric Railway’s president, Kuramoto, comes up with a bold plan to save the nearly defunct railway, hosting a ghost train event that summons real spirits. But on the night of the event, only five participants show up. As the train enters the forest, real paranormal phenomena begin to unfold…

“Because you're here, we can live our lives.” Atsushi's sincere words strike a chord with Mizuki. Mizuki, the pension owner, was facing a crisis. The pension left behind by her deceased parents was about to be acquired by a major hotel chain. If she couldn't repay the debt by the deadline, she would lose everything, including the pension. Mizuki, Atsushi, Ryo, and Tomoki struggled to come up with a repayment plan, but a major incident erupted. Jealousy, betrayal, disappointment, loss... Various emotions became twisted, and the four drifted apart.

A mysterious space sage entrusts Yuma with challenges that surpass the limits of his imagination with a stake too high. He asks, "Should you fail… then you… will lose your power as Arc." The burden of protecting Hoshimoto City alongside SKIP members are twisted by Sascal, who manipulates them, sending challenge after challenge toward Yuma. Battling giant kaiju, an evil alien bent on destruction, and a warped dimension where even time itself is distorted, Yuma must confront the ultimate test. Will he... will Ultraman Arc overcome the greatest challenge yet and protect the future, surpassing the limits of the power of imagination?