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Green Green is an anime series, adapted from an H-game and a light novel of the same name. It is set in Kanenone Gakuen ("Sound of the Bell Academy"), an isolated all-boys Boarding School at the start of the story. However, the Powers That Be send them a busload of girls to make it co-ed. The first girl off the bus is Midori Chitose, who pounces on Ordinary High-School Student Yuusuke Takazaki saying she's in love with him. Yuusuke has no idea who Midori is, but Midori thinks they were lovers in a past life.Yuusuke's closest friends at school are the Baka Trio - a Comic Trio that supplies the perversion to match the nudity supplied by their new female classmates. Male characters:
Defeat by Modesty: Subverted. Futaba almost gives up and loses the competition for domination over the bath between the boys and girls, but Yuusuke throws the match and asks for a towel to cover up her wet clothes.
Downer Ending Midori has to sacrifice her life force in order to save Yuusuke's life. Reiki then is willing to save Midori's life, but to do so she has to return back to the 31st century. Worst still, the act of returning Midori to the future has wiped everyone's memory that she was there except for Yuusuke.
Fan Disservice: Whenever the Baka Trio are doing anything perverted, including showing up nude a LOT. Episode 6 goes Up to Eleven when they get locked in the PE storage closet and have a "virtual seduction" contest, the humidity causing them to quickly go nuts and eventually end up totally nude and in a threesome while hallucinating that the other guys are the girls of their dreams.
H-Game: Based on one with the same name. The first game has the same cast as the anime, but dispenses with Reika because the "past life lovers" concept was only added for the anime, so she no longer has a use. The second game only retains Midori, while the third retains Midori and Futaba.
Hot Springs Episode: The second episode. Plenty more follow after that, including the recap episode.
Informed Deformity: Haruno Arisa is supposed to have a hideous face, yet she doesn't look all that different from the other girls to the viewer. The dub goes one step further by adding a naselly voice that makes her sound like she's constantly congested.
Omake: All three DVDs released in North America contain an omake episode consisting of 3 shorts each. Each one is perverted in their own right and always joke around with Innocent Innuendo, but The 3rd episode of the omake dives right into Hentai territory with Wakaba innocently mistaking Sanae's nipples and clitoris as poisonous mosquito bites, which she was under the impression she had to suck out the poison. The actions are quite graphic.
Spiritual Successor: The three Green Green H-games were created by a company called Groover between 2001 and 2005. In 2006, many of the same staff created a similar H-game named Edelweiss with the company Overdrive.