Lieutenant Kaneko participated in the attack on Pearl Harbor in December 1941 and the Indian Ocean Raid in April 1942. During the Indian Ocean Raid, he claimed shooting down three British Hawker Hurricane fighters and therefore achieved the status of ace. In May, he was transferred to the 6th Air Group and became its commander. The unit was intended to be the airbase garrison unit on Midway Atoll after its capture in the upcoming Operation MI. Taking passage aboard the carrier Akagi, Lieutenant Kaneko participated in the Battle of Midway, where he defended the carriers against the attacks from Midway-based bombers. He claimed to have shot down two American bombers before his carrier Akagi got hit and set ablaze. Nevertheless, He was rescued and returned to Japan.
Following the Battle of Midway, Lieutenant Kaneko was assigned as the group leader (Hikōtaichō) of the carrier Hiyō. In October 1942, the carrier was sent to the Solomon Islands. On 17 October, Lieutenant Kaneko led the fighter escort for the combined Hiyō and Jun'yō strike against the Henderson Field. The strike did very little damage in exchange for most of the Nakajima B5N bomber lost. His fighters shot down one Grumman F4F Wildcat fighter, but lost Hiyō ace Petty Officer Kaname Harada, who had to crash-land.
Several days later, Hiyō experienced a mechanical failure and its air group was transferred to a land base at Buin through Rabaul. The group operated from Buin where Lieutenant Kaneko led almost daily missions against the Cactus Air Force. During one of the raids on 11 November, he claimed shooting down three enemy Wildcat fighters. On 1 November, he was promoted to lieutenant commander. On 14 November, during the Naval Battle of Guadalcanal, he and his squadron flew a Combat Air Patrol over the convoy of cargo ships that were delivering Imperial Japanese Army troops and supplies to Guadalcanal. While attacking the enemy dive bombers that were about to bomb the ships, he was killed by one of the rear gunners. In return, he and his group managed to shoot down three dive bombers and badly damaged two more.