Srikanth dominated from the start to carve out a 21-14, 21-13 win in 34 minutes.
Sunday's win helped the eighth seeded Indian to improve his head-to-head statistics against the unseeded Japanese to 2-0.
Srikanth is the first male shuttler from India to qualify for the French Open final. Sunday's victory also made him the the fourth male player in the history of the game to win four Superseries singles titles in a calendar year.
Srikanth struggled in the early stages of the first game with the Japanese taking a 9-5 lead but he made a strong comeback to force the lead at 11-9.
The Indian did not look back from there, going on to win the opening game.
Srikanth dominated the second game right from the start, opening up a 10-5 lead and holding on to the advantage to win the game easily.
This is his second consecutive Superseries title coming on the back of his win at the Denmark Open last week.
Earlier in the year, he had won the Indonesian Open and Australia Open Superseries titles.
With this win, Kidambi is expected to rise to a career best second in the World rankings when the updated list is announced.
He already leads the chart for the Superseries finals to be held in Dubai at the end of the year.
(With IANS inputs)