[Zolda]

Yea, like everyone said, based on the name, this series likely has a sleep/dream/day-dream/imagination theme. Perhaps the internal logic works like a combination of KR Zi-O, the anime The Melancholy of Haruhi Suzumiya, the Gridman/SSSS.Gridman/SSSS.Dynazenon series, Donnie Darko (2001), Inception (2010)/Paprika (2006)/The Cell (2000), and Dreamscape (1984). The main protagonist could be an eager guy who had a big, exciting dream (hence the name Zeztz that was likely inspired by the the word zest) and possessed a latent/hidden ability, some kind of combination of reality-altering/bending/manipulation power (like Sougo Tokiwa did in KR Zi-O and Haruhi Suzumiya did) and dream infiltration/manipulation abilities similar to what the Gridman hosts and the characters in Inception/Paprika/The Cell did. At some point in the story there could happen a connection between dream and reality in the form of a reality-altering dream like shown in Donnie Darko and Rider Time: KR Zi-O vs KR Decade.

The ability to enter a human's subconscious realm was also shown in KR Wizard when KR Wizard or KR Beast entered a Gate's Underworld to prevent the Phantoms from wreaking havoc there, although it didn't cause a change in the real world, only creating new Phantoms. In KR Den-O, Imagins were also able to enter a human's subconscious realm (i.e. their contract holder's memory), traveled to the past and wreaked havoc there, and caused drastic changes in the future world. In KR Zeztz, the villains could be actual otherworldly beings that invaded the human world (and materialized) through people's nightmares, a combination of the premises of Dreamscape and Gridman/SSSS.Gridman/SSSS.Dynazenon. Dreams/imaginations could be seen as a portal to potential worlds or even alternate worlds, and the villains (and the Riders) could likely harness the energy from humans' dreams to manifest themselves and make themselves stronger. Many surreal, bizarre dream sequence scenes and confusing (or even convoluted!) internal logic similar to Inception could likely appear in the story.

The pointy corners of the logo have that jagged, slightly cartoonish look that are often used in old cartoons to depict a hole in the wall, which could be a visual clue that the villains likely came from a "dream realm" and broke free to the human world through people's nightmares. At least it looks more neutral/ambiguous and non-descript compared to KR Gavv's logo.

Mmmmmaaaaayyyyybbbbbeeeee...