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As an ammendment, I've also read that Erika Kyoukousha is simply a penname for Masahiro which would also explain why it's not listed on Mangaupdate, even though that site is usually pretty good for attributing works to authors under alternative but still known pennames.
Also, here's a page from another doujinshi by Emua called Lovey Dovey Afterschool Infirmary.
