Koko wa Greenwood (translation: Here is Greenwood), is a manga series written by Yukie Nasu. It was adapted into a six episode animeOAV between 1991 and 1993, and adapted into a 13 episode live-actionDorama in 2008.Kazuya Hasukawa is in a dreadful bind. His brother's new wife is also Kazuya's first love. Determined to avoid them both, Kazuya leaves home to live in Ryokurinryou or as it is known by its much easier to pronounce English name, Greenwood, the student dorm of the all-boys' Ryokuto Academy.There, he hopes to find peace of mind. Unfortunately for Kazuya, he starts his term a month late due to the combination of a car accident and a stress-induced ulcer. When he does finally arrive, he finds that peace (of any kind) is hard to find at Greenwood - home of some of the weirdest characters found on any campus.Now with a handy dandy character page!
Aloof Big Brother: Subverted twice with Shinobu and his siblings. Subverted with Akira, who is set up to be the Aloof Big Brother, but who turns out to be an weak-willed Ineffectual Loner who couldn't handle his responsibility to his family. Subverted again with Shinobu, who is an Aloof Younger Brother to both of his older siblings. Especially Nagisa, who has a raging inferiority complex and is constantly trying to get him at her mercy. Interesting, Nagisa seems to have perceived Akira as a straight play of this trope before he ran away, despite the afore mentioned facts.
Anachronic Order: The OAVs start at the begining, but the second episode falls roughly between the 5th and 6th (it explicitly mentions a character not introduced till episode 5). The second episode is the only completely new story not in the manga (it's a sequal to a manga story). Probably done to get an ensemble story done early, while keeping the climactic story at the end (as it was in the manga).
Delinquents: Any time anything to do with Mitsuru's junior high years comes up this trope is usually invoked somehow. It's particularly prominent in the story that introduces Miya.
Distaff Counterpart: There is a parallel girl's dorm in another dimension known as "Cherrywood", inhabited by female versions of the cast. Kazuya went there once, and spent the whole time scared and being pushed around by Shinobu and Mitsuru's female versions (some things never change).
Furo Scene: Several of these, notably one during the class trip where some of the other characters are lamenting the irrefutable truth that Shunis adude and one when the guys visit Shun's family's ryokan.
Golem: An alien made a golem that looked like Shinobu out of chocolate.
Heir Club for Men: Shun's family inherits through the female line only. Shun may be the oldest, but his baby sister is the one who inherits the Family Business. Shinobu’s family plays it straighter, which is the real source of Nagisa’s woes.
Japanese School Club: There's quite a few that get a mention: afore mentioned Student Council, the Judo club, the not-actually-an-official-club journalism club, the track team, and the brass band to name a few. Also Played for Laughs when the new school year starts and the various clubs are shown pressuring new students to join.
No Fourth Wall: In addition to the Ho Yay, the main cast sometimes talks to Nasu about plot-holes and such. The OAV has its own version, with the characters talking to each other about the story in the episode previews.
Sempai Kouhai: A lot of emphasis is put on the importance of this in general, and the various ways older students try (and usually fail) to abuse their authority over younger students. Unless they're Mitsuru or Shinobu, in which case they usually succeed.
Shout-Out: Possibly to the point of being Reference Overdosed. In any given volume of the manga as translated by Viz Media, probably half of the translation notes at the end are explanations of the various shout outs in that volume.
In all versions, Kazuya is initially tricked into believing Shun is female. In the manga/anime, he finds out the truth when he sees Shun use a urinal. In the drama, he finds out when Shun starts undressing for a bath.
Most of the Pool Episode is told from the point of view of one of the lifeguards, who spots Shun, decides he's a chick, and spends most of the chapter plotting how to ask "her" out, until the very end when Shun takes off his shirt.
Weirdness Magnet: Greenwood itself, though of a more mundane than fantastic kind of weirdness.
Whole Episode Flashback: Several, including the story about Watanabe and Fujikake, the story about how Mitsuru and Shinobu became friends, and the story about how Kazuhiro met Sumire.
Yaoi Guys: Watanabe and Fujikake of room 117. It's something of an open secret, but that doesn't stop Mitsuru from blackmailing Fujikake whenever he gets a package from home (Watanabe isn't ashamed, Fujikake is).