I'm understanding the question to mean the extremely brief interval between receiving orders and sortie-ing (presumably, to your doom). If that should be the case, that means you have approximately a day's interval or so. Possibly less.

What you would do in that "day or so" interval: write final letters to home, or to whoever would care. Maybe a few remembrance photos, too.

If we can extend the question's timeframe to include an earlier period in which a Tokkōtai pilot receives his draft orders up until he flies off for a final sortie, then you'd readily find examples of their writings in their diaries or in their letters to home. These drafted men (at the final stages of the war) tended to be university students, and they would have been well-read individuals that took to writing to find solace. An excerpt of such a letter/diary entry can be read here, in which Sasaki, a pilot, quotes Goethe in an attempt to work out his convoluted emotions in writing.

For further reading, consider picking up Ohnuki-Tierney's two works on Kamikaze pilots? I personally found them to be interesting reads.