Satsuma Tensei: Yo ni Manyou no Marujuuji ga Saku nari

1586, Kyushu - Satsuma Province. This area is often said to have been host to the most frightening battles of the Warring States period. In the midst of fighting one such battle for the unification of Kyushu, the entire Shimazu clan suddenly vanishes...?! The clan soon discovers that they've been sent back 1,300 years prior to the Warring States period, to the middle of the Imperial Crisis in 3rd century Rome - in which the fate of the Roman Empire is at stake! And when Onishima Zu and the others begin rampaging through the streets of Rome, this action-packed war spectacle truly begins! Source: Shogakukan