I can't see the pictures, but from the description I found the EXACT same bike a few years ago at a garage sale, except it was a 52 cm frame. It was in the basement of an orthodontist, used to be her triathlon bike. Shimano 105 with a 6 speed 600 freewheel, Ambrosio Elite rims on 105 hubs with the oil port (I greased them normally). Magny Ishiwata tubes, strange lack of decals, chrome fork, SR stem and bars. It was even red, like yours.
I sold it to a friend, since it was much too small for me. Definitely Japanese-made, I think it had the sticker.