Chōzenji, a Rinzai Zen temple, is associated with Ōi no Kata, the birth mother of Takeda Shingen, and tradition holds she gave birth to him at this site. After Nobutora was exiled to Suruga by Shingen in 1541, Ōi no Kata is said to have remained in Kofu, quietly supporting her son's rule, and the temple preserves the history of the Takeda clan's women.