In February it is common to see sharks in a small island in Okinawa(Ryukyu) Islands. The small place is called Yonaguni Island.
I did visit there and did see sharks.
Sharks are strong and in group.
There might be a hundred sharks.
Just in some seconds they swam passed me.
If you see the shark you will know shark is drug to attract your heart.
I also took a video.
It is not easy to access Yonaguni Island. There are regular flights between Tokyo/Naha and Yonaguni.