Isshinji has seen more than peace. A tradition tells that in 1614, during the struggle between Tokugawa Ieyasu and Hideyori, the son of Hideyoshi who was holed up in nearby Osaka Castle, Ieyasu made this temple his headquarters. The ridge on which the temple stands, close to the castle's southern approaches, makes that easy to picture. Much later, the temple suffered as the rest of Osaka did. Like most temples and shrines in the city, it was rebuilt after the destruction of Osaka in the closing years of World War Two. That is why the temple's look today is not that of a preserved medieval complex. In fact, the rebuilding gave the temple a name for unusual architecture. In 2023, Isshinji was chosen for Osaka Selection, part of the city's Living Architecture Museum program, which celebrates buildings that bring character to the city. The selection singles out the temple for two things together: Buddha images made from the ashes of the departed, and a group of unique buildings. Older faith and new design stand side by side here.