The Imagin are why Den-O works. This OVA knows it, and stops pretending the human lead matters. Four time-traveling demons arguing about food, romance, and stupid plans while accidentally solving timeline problems is the entire show, and that's exactly what it should be. The comedy lands because these characters have already earned their chemistry in the live action series, so the OVA just turns them loose. You're watching creatures that should annoy you become the only cast you actually want to follow.
A time-traveling train conductor and four mischievous creatures called Imagin find themselves caught in an endless cycle of temporal chaos. When these supernatural beings board the DenLiner, a mystical locomotive that travels through time itself, they drag an ordinary high schooler into their fractured world of paradoxes and impossible scenarios. Each episode spirals into absurdist adventures where the Imagin's childish personalities clash spectacularly with the laws of physics and causality. They mess with timelines for petty reasons, create ridiculous paradoxes out of boredom, and generally treat the fabric of reality like a playground. The tone shifts wildly between slapstick comedy and genuine action sequences, never letting you settle into what kind of story this actually is. What emerges isn't a cohesive plot so much as a collection of escalating hijinks powered by characters who don't take their own world seriously. The anime captures the chaotic energy of the original series but leans harder into pure comedy and character interaction. If you want action wrapped in weird charm and don't need everything to make perfect sense, this delivers exactly that.