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Kaoru Isawa (いさわ かおる) is a worker under Ōtsuki in Squad E in the underground labor camps.

History

Tobaku Hakairoku Kaiji

He along with Numakawa help Ōtsuki at managing Squad E. He also plays a vital part in Ōtsukis Underground Chinchiro for it to work properly.

Ichinichi Gaishutsuroku Hanchou

He plays a supporting role in the spinoff along with Numakawa.