Three Koga's in my shed, first my Adventure from around 1992. This is a high-mileage bike, many parts are no longer original because they wore out. The bike is a bit too small for me but it used to be my dad's:
A Cityliner that my wife uses for everything from commuting to riding trails:
and a Roadspeed used by one of the kids:
We've also got a Miyata On/Off Road Runner, but that's a Miyata (without the Koga) so that doesn't count.