But he'd managed to set the wire after a full three hours, when he heard the gunfight. It was past 11 p.m. He heard an explosion as well, but he couldn't afford to get involved, so he hurried back to the farm coop with Yutaka. By then the gunfire had ceased.
Finally Shinji began building the electric detonator, but this also turned out to be difficult. He didn't have the proper tools, and furthermore the device required a delicate balance. Electric current had to run through the device at the moment of impact against the school, but at the same time he had to make sure it wasn't so sensitive it'd be ignited in the middle of the rope cable by, say, a bump or knot in the rope.
But somehow he managed to build it, using a motor (which he removed from an electric razor) instead of the detonator for the test. It was right when he began testing, in other words, only moments ago, that the midnight announcement was made. The only one who died was Hirono Shimizu (Female Student No. 10), whom Shinji saw immediately after the game began. He thought it might have been a result of that intense gun battle, but in any case Sakamochi had announced something far more urgent, at least to him and Yutaka. Sector F=7, which included the cliff rock they'd climbed up on to survey the school, was designated to be a forbidden zone as of 1 a.m.
No wonder Yutaka was so impatient. If they couldn't enter that area then all their preparations would amount to nothing. It would be the end for them. He didn't want to be in the situation of, after a clever play, being just one move away from checkmate only to fall into a fatal trap.
Shinji quickly pulled out the electric detonator from the tube chained to his knife. He connected the two cylinders— their dull metallic exterior shone in the dark—and peeled off the insulation from the lead wire. Then using tape, he first secured the small plastic spring serving as the electrical switch, then took the end of the lead wire extending from the detonator and tied it to the wire from the charge device. He taped the connection over and over so it would be completely secure. Then next to the battery he installed a condenser circuit board taken from the flash component of a camera. In order for the detonator to be absolutely reliable, he needed a high voltage output. He connected the wires to this device as well. To prevent any accidental detonation, he decided he would work on the remaining wire from the electric detonator at the top of the mountain, taping the exposed end of the wire to the side of the battery. "All right."
Shinji stood up, and then put the completed detonation device in his pocket. "Lets hurry. It's time."
Yutaka nodded. Just in case, Shinji tossed his equipment, including the electrical pliers and extra lead wire into his day pack, and then lifted several piles of rope they had divided up onto his shoulder. He looked down. There was a gas can filled up with a mixture of gasoline and ammonium nitrate. To add oxygen, he stuffed in insulation material filled with air and folded in pleats. The opening was shut with the lid, but next to it another rubber lid functioning as the detonator holder was tied to it with a plastic cord dangling from the handle.
Then he looked at his watch. It was 12:09. They had plenty of time.
Okay then. He was trembling from excitement. It took a lot of effort, but now they had everything they needed. They would connect all the ropes they had, tying one end to a tree in H=7. Then they would tie the other end of the rope to the end of the fishing wire secured by the weight of a rock. They would unravel the rope and leave it there and then go around the school, going up the mountain into F=7. He would take the wire tied to the top of the tree and reel it in immediately. The rope stuck to the wire would then come to them. He would proceed to attach the pulley to the gas-can gondola with the detonation device and thread the rope through it. Then he would stretch the rope taut with one swift motion and secure it to a tree. Then the rest is...party time, dude. Have fun! Here we go! Make it happen!