I'm reading an interview in a French magazine of a Japanese veteran, Kuniyoshi Takimoto, who served on the Hiryu during the battle of Midway, where it was sunk.
At some point he says (quickly translated from French) :
A lot of survivors aren't even wounded. If they're set free, they might talk so they're gathered in a special unit : Unit 500, because they are 500 of them -- usually, a name is given to a unit but in this case, only a number is attributed. All the survivors in our ship are thus send to the Southern Pacific, the most dangerous place at the time. I'm lucky : because I'm being hospitalized for a month, I survive. If I had been sent there, I would have died too.
Although it sort of strike me as something the Japanese Navy would do, I can't find any information online about "Unit 500" or the fate of the surviving sailors of the Hiryu. Also I'm quite curious about the length the Japanese Navy went to in order to conceal the defeat at Midway, either within the army or to the Japanese population.
You may be interested in this answer I gave on this very topic about a week ago. It focuses on all the survivors of the Kido Butai, but the former crew of the Hiryu would have been given no special treatment.
https://www.reddit.com/r/AskHistorians/comments/6titeb/japanese_publics_reaction_to_midway/
Remember the Allies landed on Guadalcanal 8 weeks after Midway, and the forces fought two more carrier battles that fall, along with daily or near daily air battles over the islands. This meant that especially the fighter squadrons rom Rabaul were bleeding out men at a prodigious rate.
For more on the KB I would also suggest Shattered Sword by Parshall and Tully.
For the fighting in the Solomons I would suggest Islands of Destiny by Prados or First Team at Guadalcanal by Lundstrom.