Kobayashi was a fish scouter for an Osaka-based cannery. His job was to search for schools of fish, and inform the company's fishing boats of their whereabouts. While scouting one day, Kobayashi's plane ran out of gas and he was forced to land and take shelter on Iwato Island, leaving him with a sprained wrist. Shortly thereafter, Kobayashi was rescued by his good friend and fellow fish scouter Shoichi Tsukioka. The two celebrated their reunion, but discovered that the monsters Godzilla and Anguirus were battling on the island. The monsters eventually both fell into the ocean, giving Kobayashi and Tsukioka time to escape. When they got back to Osaka, they informed the authorities of the monsters' existence and were shown several pictures of dinosaurs from which they were to identify them. After they identified the monsters as Godzilla and Anguirus, Kobayashi and Tsukioka listened to Dr. Kyohei Yamane give his account of the first Godzilla's attack on Tokyo a year before. Godzilla and Anguirus eventually came ashore in Osaka and destroyed the city, forcing Kobayashi and Tsukioka to be transferred to a branch of their company in Hokkaido. During a company party, Kojikawa and Tsukioka were called out to search for Godzilla, who had apparently just sunk one of the company's ships. When Tsukioka found the monster on an icy island, Kobayashi came to mark the location for the Japanese navy and air forces. The J.S.D.F.'s bombing efforts proved futile, and Godzilla began walking back to the sea. Kobayashi flew his plane at Godzilla to try and distract him, but Godzilla shot down Kobayashi's plane and caused it to crash into the slopes of the island, causing an avalanche of ice to fall onto Godzilla. Kobayashi's sacrifice would not be in vain, as this gave the J.S.D.F. the idea of blasting the slopes on the island and burying Godzilla in ice. After several missile strikes, Godzilla was completely submerged under the ice, ending his reign of terror for the time being.