The 98th sentai was under IJN command as the torpedo attacker unit deployed in Kanoya of Japanese homeland from February to October in1944 to join the Aerial Battle of Taiwan-Okinawa.
By the way, there were G4Ms of IJN 761-Ku in Davao, Mindanao Island in September, 1944.
They were not busy on September 13 as being prepared for the attack against a target in New Guinea scheduled on the 19th.