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Itsuki Noya is a rich young heir who is just starting his school year at Ebisugawa High School. Always fascinated with the stars, he decides to join the school's Astronomy Club. For some reason, however, the club is housed on the basement, and through confusion of kanji, ends up in the "Astronomical Club", an all-girls' otaku club, filled with such an eclectic cast as loudmouthed president Kyouko Todayama, beleaguered fujoshi Hakata Kanamori, stoic Rikei Hiromatsu, kindhearted vice-president Hasumi Ohba, and their adviser... a cat named Omori. Stuck with them (and in women's clothing), Noya must endure the craziness he has stumbled into. Add to that Kyouko's younger sister Izumiko, who also happens to be Itsuki's personal maid and the incredibly {{tsundere}} StudentCouncilPresident Yuka Iseda, and Itsuki will have the time of his life.

''Ebiten: Kouritsu Ebisugawa Koukou Tenmonbu'' ("Ebiten: Ebisugawa High School Astronomical Club") is an ongoing 2008 manga series written by SCA-ji and illustrated by Kira Inugami, with a Summer2012Anime web adaptation directed by Hideki Okamoto under Creator/{{AIC}}.

The series is currently streaming on [[http://www.crunchyroll.com/ebiten Crunchyroll.]]

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* AlternateCharacterReading: "Tenmon-bu" can be read as two different sets of kanji -- "天文部" ("Astronomy Club") and "天悶部" ("Astronomical Club"), thus the reason Noya accidentally joins an all-girls' otaku club where he intended to join a stargazers' circle.
* BareYourMidriff: Kanamori in the SexySantaDress.
* ButtMonkey: If someone is going to be harassed and stripped, it's most likely going to be Kanamori.
* CutenessProximity: Small things turn Rikei from stoic, into a ''slightly'' less stoic fan girl.
* DraggedIntoDrag: In order to stay in the club, Todayama forces Itsuki to dress in women's clothes.
* InnocentFanserviceGirl: Kanamori due to all the strip searches done to her.
* LateForSchool: Kanamori invokes this trope after she oversleeps. She also immediately wishes she had a slice of toast in her mouth and hopes to run into a dashing gentleman in the process.
* NamesToKnowInAnime
** Itsuki Noya -- Creator/MamikoNoto (drama CD) and Creator/MariyaIse (anime)
** Kyouko Todayama -- Creator/AmiKoshimizu (drama CD) and Creator/KanaAsumi (anime)
** Izumiko Todayama -- Creator/EmiriKatou (drama CD) and Creator/IoriNomizu (anime)
** Hakata Kanamori -- Creator/MaiNakahara (drama CD) and Asuka Nishi (anime)
** Rikei Hiromatsu -- Ayumi Tsuji (drama CD) and Risako Murai (anime)
** Hasumi Ohba -- Creator/AyakoKawasumi (drama CD) and Creator/SatomiSato (anime)
** Yuka Iseda -- Creator/RieKugimiya (drama CD) and Midori Tsukimiya (anime)
** Shouko Ohmori -- Creator/KaoriNazuka (Anime)
* {{Parody}}: From SaintSeiya, to ''Franchise/SailorMoon'', this show will mock them.
* SexySantaDress: Kanamori is put in one in episode 2.
* TheStoic: Rikei.