* '''2022-06-01:''' Became possible to equip in [[:Category:Yamato Class|''Yamato''-class Kai Ni]]'s expansion slots
* '''2022-06-01:''' Became possible to equip in [[:Category:Yamato Class|''Yamato''-class Kai Ni]]'s expansion slots
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* '''2022-06-08:''' Visible bonuses added and became '''upgradeable''' to {{Equipment/Link|15.5cm Triple Secondary Gun Mount Kai Ni}}
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* '''2022-06-08:''' Visible bonuses added, became upgradeable to {{Equipment/Link|15.5cm Triple Secondary Gun Mount Kai Ni}}, no longer upgradeable to {{Equipment/Link|15.5cm Triple Gun Mount Kai}}