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Kaoru Isawa (石和 薫) is a worker under Ōtsuki in Squad E in the underground labor camps.
History
Tobaku Hakairoku Kaiji
He, along with Numakawa, helps Ōtsuki in managing Squad E. He also plays a part in Ōtsuki's Underground Chinchiro that is vital for it to work properly.
Ichinichi Gaishutsuroku Hanchou
He plays a supporting role in the spinoff along with Numakawa.
He is noted to be the irresponsible type.