Kajioka was promoted to lieutenant commander in 1924, and was assigned as chief navigator to the Asama, Nachi and battleship Mutsu.

The second assault on Wake Island, reinforced with heavy cruisers and the aircraft carriers Sōryū and Hiryū, was more successful.

He narrowly escaped disaster when the US Navy launched a counterattack across the Owen Stanley Range, which damaged many ships in the invasion fleet, but after troops and supplies had already been landed.

In April and May he commanded the Take Ichi convoy, which suffered heavy losses while carrying two Army divisions from China to New Guinea.

Kajioka was killed in action on September 12, 1944, when his destroyer Shikinami was torpedoed by USS Growler east of Hainan.