Grandpa directs them to ask Granny, the chief of the heavily forested Forlock, about the penchant. Klonoa and Huepow, alarmed by all this, go back home to Klonoa's grandfather to ask him about the situation. He also intends to kidnap Lephise, a diva that is said to come from the legendary Moon Kingdom, to prevent her from singing the Song of Rebirth that would thwart his agenda. When the two investigate, they find a mysterious, sinister man named Gladius & learn of his plans: to use a mysterious Moon Pendant in order to revive the legendary Moon Kingdom and spread nightmares across Phantomile. Some time later, after having a nightmare involving a ship crashing into a nearby hill, Klonoa and Huepow awake when exactly that happens. He comes across a mysterious ring while playing in the forest one day - upon grabbing it, he ends up meeting Huepow, an orb-like spirit who can go inside the ring's gem. The game stars the titular Klonoa, a rabbit/cat-like Cartoon Creature who lives in the dream land of Phantomile.
It was originally released exclusively on the PlayStation in 1997 in Japan, with an international release following in 1998. Klonoa: Door to Phantomile is the first entry in the Klonoa series.