Earlier this year I got the chance to work for a few months on an upcoming book by Akihiro Nishino called Honya no Poncho, with the guys at Mugenup.
This is a concept to help find the look of the main setting.

Doing a bit of promotion for the book :p which you can pre-order here: https://www.amazon.co.jp/dp/4344033833/ref=cm_sw_r_cp_ep_dp_mgAYBbQFGZ6Z4

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