The boy sat on the cruiser's deck floor with just his head poking above the side. He was gazing intently at the island. There was no expression on his face. Leaving your natal land usually elicited a special surge of emotion, but the boy didn't seem to know how to express such sentiments. The moment they'd taken him aboard the cruiser, he'd quieted down, and now for some time he'd sat there without once budging.
There was nothing to do but call off the survey. Their top priority was to take the boy back to the city and to hand him over to the proper authorities. Unable to conceal their excitement at the unexpected catch, Naito and Kano exchanged theories about the boy's provenance and stared unabashedly at him as at a wild child who'd been reared by wolves.
No one else had a clue. But Kensuke could paint a reasonably good picture of what had transpired on Battery No. 6 in the last nine years. One look at the child's face was enough to make everything clear. The refined small nose, the clear glacial eyes, the thin lips - though obscured by a mass of overgrown hair, all of the boy's features bore an irrefutable resemblance. It was in third grade that Kensuke and Aso had first met and gotten to know each other. The profile of the boy who sat before Kensuke now was the living image of his former classmate. Without a shadow of a doubt, this was Aso's son by Yukari Nakazawa.
Aso had lied. He hadn't stripped Yukari naked and deserted her on Battery No. 6. The absurd scheme of turning an uninhabited island nearby into a paradise on earth had no doubt been Yukari's suggestion; Aso, while horrified by the inanity of it, must have helped her out. How else could the vegetables and fruits growing on Battery No. 6 be explained? Moreover, the boy wasn't naked; they were rags by now, but he was clothed. The bare essentials for survival must have been prepared at the outset and brought to the island.
Where, then, was Yukari, the boy's mother? Probably dead and buried. If she were alive, she'd have to be somewhere other than Battery No. 6. In any case, she wasn't a living inhabitant of the island. Assuming Aso hadn't lied about absolutely everything, Yukari had become pregnant that summer nine years ago - and given birth the following year. That made the boy eight years old. If he'd been living with his mother for the whole time, he'd know how to speak. Instead he must have lost his mother when he was around five, and forgotten, during the solitary years that followed, even the little he'd learned from her. Whether Yukari had died on Battery No. 6 or abandoned the child and escaped alone would be clear if and when they dug up the mound under the wooden tablets.
Kensuke's hunch was that Yukari rested in peace under that mound of earth.
The satisfied expression on Aso's face as he lay at death's door… At long last, Kensuke understood. Aso had smiled to himself for secretly having disseminated his seed here on earth. The force that aided the strange seedling from afar didn't work for plants alone. Kensuke was looking at the proof.
Sensing that Kensuke was staring at him, the boy met his gaze. Almost no expression appeared on the boy's face as he turned it back toward Battery No. 6 shrinking in the distance.