Japanese love uniforms for school kids (from elementary to high school and sometimes college). These kids are just wearing white and red caps (I think they’re reversible), but they’re ready for a field trip with their art set/clip boards(?). Some schools have the kids in a pretty elaborate set of navy blue coat, shorts, and brimmed hat. And of course the awesome leather backpacks called randoseru ランドセル. Spring is field trip time so should be easy to get a pic next time.