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Takuya Numakawa (沼川 拓也) is a worker under Tarō Ōtsuki in Squad E in the underground labor camps.
He has a spin-off manga called 1-nichi Koshitsuroku Numakawa where he is the protagonist.
History
Tobaku Hakairoku Kaiji
He and Kaoru Isawa help Tarō Ōtsuki manage Squad E. He also plays a vital part in Ōtsuki's Underground Chinchiro for it to work properly.
1-nichi Gaishutsuroku Hanchō
He plays a supporting role in the spinoff along with Isawa.
He is not used to going outside the underground labor camp for a day and struggles on how to enjoy his time outside. Ōtsuki decides to teach him how to enjoy the day.
1-nichi Koshitsuroku Numakawa
Numakawa buys a one day ticket for an apartment. He grows bored since he is still underground. He sings karaoke and is overheard by his fellow miners.