Hen Semi

• Portal — yes

• Type — tv series • Director — Takao Kato • Producer — * Yūichi Yamada • Gō Nakanishi • Writer — Takamitsu Kōno • Music — Masaru Yokoyama • Studio — Xebec • Network — MBS, AT-X, BS11 Digital, Tokyo MX • First — April 3, 2011 • Last — July 3, 2011 • Episodes — 13 • Episode List — #Anime television series

• Type — ova • Director — Ryouki Kamitsubo • Producer — * Yūichi Yamada • Fumitake Kobayashi • Writer — Takamitsu Kōno • Music — Kei Haneoka • Studio — Xebec • First — July 23, 2010 • Last — March 23, 2011 • Episodes — 2

• Type — manga • Author — TAGRO • Publisher — Kodansha • Magazine — Monthly Morning Two • First — December 21, 2006 • Last — June 22, 2015 • Volumes — 11

• Ja Kanji — 変ゼミ • Genre — Comedy

Nanako falls in love with Komugi and she joins a seminar which he enrolls, but the seminar is an abnormal seminar. Sexual harassment-like assignments and eccentric classmates confuse her.

• Nanako Matsutaka (松隆 奈々子, Matsutaka Nanako) • Kana Hanazawa • Nanako is a normal university student, who happened to enroll in Abnormal Physiology Seminar. She tries to keep her mental state sound, but other abnormal classmates start to influence her personality... • Komugi Musashi (武蔵 小麦, Musashi Komugi) • Akira Ishida • Nanako has a crush on him. He is a handsome young man, and also a very straightforward person who is not afraid to discuss his perversions, much to the displeasure of others nearby. He also has a Netorare fetish. • Miwako Mizukoshi (水越 美和子, Mizukoshi Miwako) • Yukiko Takaguchi • Komugi's ex-girlfriend. She is a beautiful woman, but also a masochist and often gets lost in wild sexual fantasies. • Anna Katō (加藤 あんな, Katō Anna) • Ryōko Shintani • A new student from Kanazawa, Ishikawa. She looks like a delinquent, but actually has a split personality. She was originally a sadist to her little brother. • Yesterday Taguchi (田口 イエスタディ, Taguchi Iesutadi) • Minoru Shiraishi • A dissolute student who wants to be a manga artist. He is in a codependency relation with Makiko. • Makiko Gregory (蒔子＝グレゴリー, Makiko Guregorī) • Shiho Kawaragi • An elusive blonde student who is half British and half Japanese. She is an assistant of Yesterday. • Hishiyasu Ichikawa (市河 菱靖, Ichikawa Hishiyasu) • Norihisa Mori • A punk rock and otaku style student who films other people's perversions. He is also a mysophobe. • Kenji Meshiya (飯野 堅治, Meshiya Kenji) • Takashi Matsuyama • The seminar's professor. He looks like Kenji Eno. • Yūji Horii (堀井 幽璽, Horii Yūji) • Kenjiro Tsuda • Kenji's senpai who sometimes asks him for money despite being a wealthy man. He is famous for having developed an eroge. He looks like Yuji Horii. Miwako later dates him.

Hentai Seiri Seminar appeared serially in 5 episodes in Wanimagazine's hentai manga magazine Comic Kairakuten, and it was contained on a collection of TAGRO's short stories in 2004 by Daitosha. Hen Semi was first serialized in Kondansha's seinen manga magazine Morning 2 in 2006. As of August 2011, 5 volumes have been released.

The first volume was released with the limited edition of volume four of the manga on July 23, 2010; and the second volume was released with the limited edition of volume five of the manga on March 23, 2011. The opening theme is "Maniaekirakira (マニアエキラキラ)" by Nobuhiro Makino (composition and arrangement), Hitomi Mieno (lyrics), and Kana Hanazawa (vocals) and the ending theme is "Hen Rin Shan; Hen da yo. Rinsū no Ato ni Shanpū te (変・リン・シャン 〜変だよ。リンスーの後にシャンプーて〜, "Hen Rin Sham; It's abnormal to shampoo after rinse")" by Ataru Sumiyoshi (composition and arrangement), Hitomi Mieno (lyrics), and Kana Hanazawa, Minoru Shiraishi, Norihisa Mori, Takashi Matsuyama (vocals).

In December 2010, an anime television series adaptation of Hen Semi was announced on Kodansha's website. Produced by Xebec under the direction of Takao Kato and scripts by Takamitsu Kōno, the series began its broadcast between April 3 to July 3, 2011, on MBS. The duration of the episodes is half of that of a regular anime episode: 12 minutes instead of 24 minutes. The opening theme is a non-lyric song "Hen Zemi Hajimaru yo! (変ゼミ始まるよ!, "Hen Semi Will Start!")" by Masaru Yokoyama and the ending theme is "Punctuation!" by Hajime Kikuchi (composition and arrangement), Hitomi Mieno (lyrics), and Kana Hanazawa (vocals).

A weekly internet radio show titled Hen Lab (変ラボ, Hen Rabo) began airing on March 15, 2011, on Animate TV. It is co-hosted by Minoru Shiraishi, Norihisa Mori and Takashi Matsuyama.