Seishoko-ji is a Nichiren temple in Hamacho Park, Tokyo, dedicated to Kato Kiyomasa. It was built in 1861 on the site of the former Kumamoto domain residence and enshrines a divided spirit of Kiyomasa brought from the main Kumamoto temple. After the Meiji Restoration it became Kato Shrine, then returned to Buddhist form in 1885 and was renamed Hamacho Seijo Kodo. There is no signage explaining its history, and wild grass grows thick on the grounds.