You should be able to find a new steel flat bar bike for under Y90000. Gios Ampio is a nice choice (I have one), around Y80000 list and you should be able to get it for less than that. If you consider aluminum frames you'll have a lot of options, with at least one model in your price range from just about ever major manufacturer.Sorry for not being specific, if possible I want a used road bike, with flat handlebars.
I'm 74kg (the last time I looked) and I'd be very wary of riding any carbon frame whose history I didn't know. Definitely not "any make, scratches OK, as long as it works". And if I weighed 105kg, it would have to be brand new, from a reputable maker, and chosen carefully.Sorry for not being specific, if possible I want a used road bike, with flat handlebars. Any bike considered, carbon or steel frame, with 12 gears or more. Do not care about colour, make, components, type of tyes, type of pedals, scratches ok, as long as it works, has two wheels and air in the ires and is 55cm and above anyting considered.