Mount Kōya
Following his involvement in the Korean campaign, Masanori was involved in the pursuit of Toyotomi Hidetsugu. He led 10,000 men in 1595, surrounded Seiganji temple on Mount Kōya, and waited until Hidetsugu had committed suicide. With Hidetsugu dead, Masanori received a 90,000 koku increase in stipend, and received Hidetsugu's former fief of Kiyosu, in Owari Province as well.