Ep. 1: Hirata's World / Speak of the detective! Usami-chan

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Hirata came to a realization that he is only a manga character in a barren world, he hopes for a rival to appear like in typical Shōnen manga, and he was granted one—wearing panties on his head. After frequent appearances made by other, weird creatures and supposedly defeating the evil lord, Hirata came to the slow—and awkward—realization that he is actually in a gag manga. The second part continues Usami-chan's adventures in solving more perverted cases in the school. (Source: Wikipedia)