Jirobo was trapped by Sagen and Iga Ninjas; Jirob’s on the verge of death, but he's saved by a bizarre demon-entity. The secret Jirobo is guarding is of that kind of magnitude. It all started further back in time, in 1559, when Nagao Kagetora -eventually called Uesugi Kenshin- and Taehime, the Chief Advisor Konoe Sakahisa’s younger sister, had a small exchange of mutual feelings ...
Thus, in order to avoid the peril, 
to proceed in secrecy,
Para evitar que eso ocurriera, 
habían tomado ciertas medidas
Para evitar que eso ocurriera, 
habían tomado ciertas medidas
Sachant cela,
Para evitar o perigo e 
manter o plano em segredo,