Question: When was the ace of the Imperial Japanese Navy Air died who served during World War II and who was squadron mate of Toshio Ōta?
Sentence (from "Tainan Air Group"): Several of the unit's aces were among the IJN's top scorers, and included Hiroyoshi Nishizawa, Saburō Sakai, Junichi Sasai, Watari Handa, Masaaki Shimakawa, and Toshio Ōta.
Relevant evidence: No