Unfortunately I think this one will have to remain unattributed.
For the sake of completeness, the artist is likely to be one of the following; Daisuke Satake, Hiroshi Nakamura, Masanori Waragai, Masahiro Miki, Masanao Katayama, Mai Hatsuyama, Yusuke Kato, Ryuji Baba, Kota Tonaki, Kento Koga, Tetsu Takahashi, Tsutomu Kitazawa, Wataru Kami, Yusuke Oda, Emi Kaneko
Awesome find!
IMHO it seems impossible to attribute it to any specific artist, but I’d love to be proved wrong :).
Unfortunately I think this one will have to remain unattributed.
For the sake of completeness, the artist is likely to be one of the following; Daisuke Satake, Hiroshi Nakamura, Masanori Waragai, Masahiro Miki, Masanao Katayama, Mai Hatsuyama, Yusuke Kato, Ryuji Baba, Kota Tonaki, Kento Koga, Tetsu Takahashi, Tsutomu Kitazawa, Wataru Kami, Yusuke Oda, Emi Kaneko