I would buy a PS2 solely for this game:

go for it.

I think my wife would kill me.

I see that game used all the time, and I have a PS2. I can help you live your dreams vicariously.

your wife should enjoy it. it's fun and fucked-up japanese weird.

I would import a J-PS2 solely for this game, though it may come out here eventually:

http://www.seaman.tv/seaman2/

Seaman 2 focuses on a stage of evolution beyond [the first game] - a race of tiny prehistoric humans no taller than 20 centimetres.
The sequel moves the setting from a tank to an artificial island created to the scale of its occupants. As before, you can instruct and comfort your Seaman using voice communication, although it is far less the focus of the game this time around, also introducing direct contact with the environment via a giant hand. Whereas the previous game had you acting as the Seamen's keeper, maintaining your charges' food supply and temperature, with Seaman 2 your role is more like that of a god, illustrating your deific abilities with thunder and earthquakes. But, as before, you can educate your Seamen verbally; he will ask you about his environment, and you can introduce him to the modern world.

Initially, your Seaman is unable to communicate in language, instead talking in and responding to animalistic grunts and squeals which you will have to learn to replicate if you wish to tame the creature.

100's of funky levels to get down to.

uh waht?

Space Channel 5 is super fun. I ended up with a bunch of Ulala fridge magnets somehow.

hey look Dan, from Sega's leaked TGS list:
Space Channel 5 Part 3 (Xbox 360, PS3)
Space Channel 5 Showtime (Wii, DS, PSP)

omg!

list might be fake, but still

ok wau

list is a fake. boo.

ban kotaku

ok mad

haha I read about how Lady Miss Kier lost a lawsuit with sega over this.