Natsumi-san, you have all the good stuff; here in the USA, we called that bike a "Trail 70". . .and I had one in "Candy Apple Red" (1969)! I teach automotive electrical here at a technical college, and nowadays all of those connectors would use "weatherpack" type technology. . .but I remember the old style with the clear insulators. Japan did very well with the technology available at the time; there are plenty of those old motorcycles still on the road (like yours)!