Eien no 0 (The Eternal Zero) (Kodansha Bunko)

[Machine Translation] I can't die until I see my daughter, to keep my promise to my wife. Why did this man, who kept saying so, voluntarily die in the Zero fighter? In the summer of the 60th year after the end of the war, Kentaro was researching his grandfather's life. A genius but a coward. He is perplexed by the different image of his grandfather from what he imagined, but a mystery emerges. When the fragments of his memory come together, the truth is revealed. A story of manhood and family ties that will bring tears to your eyes.

「娘に会うまでは死ねない、妻との約束を守るために」。そう言い続けた男は、なぜ自ら零戦に乗り命を落としたのか。終戦から60年目の夏、健太郎は死んだ祖父の生涯を調べていた。天才だが臆病者。想像と違う人物像に戸惑いつつも、一つの謎が浮かんでくる-。記憶の断片が揃う時、明らかになる真実とは。涙を流さずにはいられない、男の絆、家族の絆。