The anime series' first episode received mixed reviews from Anime News Networks staff during the Winter 2017 season previews. Rebecca Silverman noted how the aesthetic of the episode, with its alien designs and story presentation, added to the basic shonen introduction that felt like a return to the fun Saturday morning cartoons of yesteryear. Nick Creamer criticized the first half for having stilted writing and the second half for revealing the show's "fundamental blandness" with a lackluster execution of its premise. Bamboo Dong said that the show wouldn't have the longevity to be in the "Annals of anime history," but gave praise to the overall throwback to '90s cartoons in both its character designs and "sense of nostalgic excitement." Paul Jensen expressed what both Silverman and Dong said about the Saturday morning cartoon quality of the series' episode, saying it will appeal to that kind of audience for a few episodes instead of the average "late-night anime audience." Theron Martin commended the visual style and technical transitions throughout the episode but was critical of the two main leads having generic personality traits.