I found four young cherries on the bank of outer moat where my comute train passes every day. They locate between Suidobashi and Ocyanomizu. Unfortunately I couldn't go near. So I couldn't identify properly. I think they are Yoko Yoko because of the color and blooming time. It's too late to be Kawazu - zakura. Also colour of the petals are too flat pink and no tint of colour at the edge of the petals.