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Artist's commentary
Summer Guderian and Erwin
Topic: "AkiyamaYukari", "Erwin"
#GuPOneHourMidnightDrawingBattle
#GuPOneHourMidnightDrawingBattle_20200726
Guderian is the soul name given to Yukari by the history girls.
Source: https://twitter.com/QRcode___/status/1287380214528405504