Shugosho, Sengoku jōkamachi no kōzō to shakaiNobuo Ishii, Hiroshi Niki · First published 2017Open the Tome
Chūsei Nihonkai no ryūtsū to minatomachiHiroshi Niki, Tomoko Watanuki · First published 2015Open the Tome
Iimoriyamajō to Miyoshi NagayoshiHiroshi Niki, Hitoshi Nakai, Yūki Nakanishi · First published 2015Open the Tome
Izumi-shi no kōko, kodai, chūseiMasashi Ishibe, Towao Sakaehara, Hiroshi Niki · First published 2013Open the Tome
Jinaichō no kenkyūSumio Minegishi, Osamu Wakita, Kenʼichi Ōsawa, Hiroshi Niki · First published 1998Open the Tome
