I don't know if Japanese aircraft were like the British ones, but in equivalent-size RAF aircraft the pilot would have a seat parachute, i.e. the harness would be such that he was sitting on the parachute pack. The seat was set low and dished to match.
Thus a parachute or equivalent cushion was necessary for the pilot to be at the right height to fly the thing and see out properly.
Chest or back parachutes are other possibilities. If the Japanese seats were designed for pilots wearing either of those configurations, they could fly the machine just as well without a parachute.
This site (a kamikaze pilot's manual) doesn't mention parachutes, but it does say that "In the event of poor weather conditions when you cannot locate the target, or under other adverse circumstances, you may decide to return to base. Don't be discouraged. Do not waste your life lightly. You should not be possessed by petty emotions. Think how you can best defend the motherland. Remember what the wing commander has told you. You should return to the base jovially and without remorse."
Possibly that would extend to baling out, but only over Japanese territory, where the pilot could return to his base to try again another day. I don't actually
know, though.
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