Kakyuusei 2 (and all the rest) Question

[XenoSaber]

I am about to watch Kakyuusei 2 TV. I was wondering if:

Kakyuusei OVA
Kakyuusei Elf Ban OVA
Kakyuusei TV
Kakyuusei 2 TV
and
Kakyuusei 2 ～ Ki Hanashi Atsumari [Anthology] ～ (Hentai)

are related to each other?

I have read that Kakyuusei OVA is not related to Kakyuusei Elf Ban OVA and Kakyuusei TV. And that they are not related to Kakyuusei 2 TV. Is this True? And where does the hentai fit in, if at all?

[pathos]

I've seen Kakyuusei Elf Ban, Kakyusei 2 TV, and either Kakyuusei TV or OVA, not sure which (it's been awhile).

Kakyuusei 2 TV had different characters from the other 2. Different story, looked like a different school, etc.

Elf Ban, and the TV (or was it OVA? whichever) had the same cast of characters, but one was basically a retelling. Different story, different "main girl" as a focus, although all the girls were in both.

I'm sure someone will be able to pin this down a bit better

[Jadawin]

Elf Ban Kakyuusei is one of my favorite anime series. Probably because it was one the first Bishoujo game type OVAs I have seen.

Basically we have
1) Elf Ban Kakyuusei OVA and TV Series
2) Kakyuusei 2 TV Series and Hentai OVA

3) Kakyuusei OVA

1) and 2) are based on games by "élf", with Aya Kadoi (I love her drawings) as the chara designer.

Elf Ban OVA (two different versions of Episode 4: normal non hentai, and soft hentai version) has Mizuho as female lead, while in Kakyuusei TV the main female character is Ai. Both also have different male main characters.

The first two eps. of 3) Kakyuusei OVA were released as "First Loves" in the US by Softcel (only available on tape).

More info can be found here:

http://ho.ho.net/kakyuusei
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=2393
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=2392
http://www.elf-game.co.jp/

And then there are also the Doukyuusei OVAs (part of it releases as "End of Summer" in the US), the Doukyuusei 2 OVAs, Refrain Blue OVAs (also with Aya Kadoi characters) etc.

[DocWatson]

Let me throw in this post (http://forums.animeondvd.com/showthreaded.php?Cat=&Board=region1&Number=1312342 ).