These are eriocapitella hupehensis or more commonly known as Japanese anemone. The yellow/green flower centers surrounded by the white petals emerged from the darkness before dawn.
On workdays I get up at around 4:30 a.m. This was good in summer but now is too early for a morning walk and photographing. The sunrise time in Tokyo is currently at around 5:50 a.m.
Originally the flower was pink and the white one is a crossbreed. Japanese anemone signifies patience, decrease of love, slight (romantic) feelings, and being sensitive.