Is Sakasama no Patema: Beginning of the Day hentai?

Special · 2012 · 4 episodes · PG-13 - Teens 13 or older

Sci-Fi

Despite leading a peaceful life as the princess of a subterraneous colony, teenage Patema longs to escape her cramped industrial confines and experience someplace different. While satiating her curiosity by exploring a region known as the "danger zone," she is startled by a cloaked figure and falls into the darkness of an abyss. Awakening with the sky below her feet and the ground hanging above, Patema finds herself clinging to a fence at the mercy of a seemingly reversed gravity. Although a nearby student named Age is able to rescue her, they are left wondering which of the two is actually upside down. [Written by MAL Rewrite]