As for the Imperial Japanese Navy’s last heavy (first-class) cruisers in World War II, the Ibuki-class Ibuki and Kurama, touted as the strongest in anti-aircraft combat, and the Modified Ibuki-class aka the Tsukuba-class...
It has become a history in which the last heavy (first-class) cruisers of the Imperial Japanese Navy in World War II, the Ibuki-class Ibuki and Kurama, hailed as the strongest in anti-air combat, and the modified Ibuki-class, namely the Tsukuba-class Tsukuba and Ikoma, do not exist. The first ship of the incomplete modified Suzuya-class is treated as being Ibuki, which in the end was never completed. As traces, all four ship names remain as those of a previous generation of battlecruisers, but these are entirely different ships. Because they mounted an advanced weapon that, as a close-in air defense system, was like an OOPArts on the level of a T-34’s engine for its time—namely, a Japanese-original 25 mm “anti-air machine gun” (strictly speaking, an autocannon due to its 25 mm caliber) and a radar-linked automatic tracking mechanism—none of the four ships suffered any air raid damage at all, they shuttled back and forth many times between Southeast Asia and the Japanese mainland escorting material convoys, their torpedo equipment was removed, depth charges were installed for anti-submarine purposes, and they were operated separated from the main fleet, but later the U.S. Navy’s submarines targeted them relentlessly, and torpedo attacks reduced the speed of all four ships, and with no repairs possible, they became unable to move from the Southeast Asia area. At the end of the war, Kurama and Ikoma were disarmed in Indonesia and handed over to Indonesia, and Ibuki and Tsukuba, which could not be repaired, had their equipment removed and were scuttled off Singapore. In Indonesia they could not handle either Kurama or Ikoma, and only operated the anti-air machine guns and the radar-linked automatic tracking mechanism, and in the war of independence the anti-air machine guns were peerless against the Dutch forces. Because the existence of these anti-air machine guns has disappeared, Western anti-air equipment has changed from memory. In particular, it has become as if…
This case is part of the Mandela Effect case database based on "The Window of Opportunity: A Guidepost to the Mandela Effect — The Ultra-Secret X-Files" by Aoyama Takuto.