Howdy
Best I can figure this is an early 70's Nishiki Super 5. The Serial Number is KS94055
The freewheel date code is NG, which for Maeda (Suntour) indicates July of 1971 per the vintage Trek site. Please correct me if I'm wrong.
This may well have been an old rental bike, there's a some kind of serial number scribed on the top tube & the handlebars, & it has not been maintained to speak of as far as I can tell.
The bike's a bit rough, but I'm going through & greasing all the bearings, & upgrading to alloy wheels. It should make a good solid beater.