Japan has the two most beautiful seasons to visit in a year. One is in spring when you can see the amazing world of cherry blossoms and the other is in autumn when you can enjoy the marvelous world covered with Japanese colored maple leaves.
In Kyoto and Nara, cherry blossoms usually get in full bloom around the first week of April (The time depends on each year.)
I hope you will enjoy the world of pink!pink! pink!