Sindhu, who slipped a place to be number three in the world rankings released today, defeated Ohori 21-14, 21-17 in a second round match lasting 39 minutes.
The Indian faces another Japanese, fifth seed Akane Yamaguchi, in the quarterfinals tomorrow.
Saina Nehwal is scheduled to play her second round match against China's Chen Yufei later tonight.
It was curtains for India in the men's singles after HS Prannoy went down fighting to Japan's Kazumasa Sakai 21-11, 10-21, 15-21 in a 54-minute battle.