グラーフ・エアポンプ・システム

Self air pump system.

ಠ_ಠ

I just realize.
if you upload PNG file, Pixiv'll convert it to JPEG Orz
So if you want these chibi, here you go.
https://drive.google.com/open?id=1hOj8C6hckIaFZQUHWeRXTi3EBV_08H0o

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