Guns First Being Introduced to Japan Was Actually ______ First Being Introduced to Japan!. Tokio and Calen arrive to Tanegashima in 1543 to when guns first arrived to Japan. What the Europeans actually brought were... actually underwear?! However, Akudarma actually steals the underwear and at this rate, they won't be able to witness the True History. And so instead, they use... Tokio's underwear?! His underwear ends up becoming a hit throughout the town. Despite it being their mission, Calen couldn't help but feel conflicted about it. Apparently there was something strange about the lord of Tanegashima, as well...