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Nanako-san Teki na Nichijou is a classic. From what I've gathered, the special chapters and maybe some of the second series were serialized in the hentai magazine COMIC Megahouse. So even though the series never went into full-on hentai, Kawara was able to get away with whatever he wanted. There was another sequel series called Nanako Dash or something, exclusive to some mobile comic app, and the difference in content is staggering (though the fame he got from Erased might have made him want to play it safe, too).