What is with Koishi going for all worldwar stuff?

Artist's commentary:

守矢神社の黒い悪魔
結局まだ描いてる…orz
『まず敵機の存在を素早く発見し、奇襲するために敵に悟られぬように可能な限り接近し、至近距離から機銃掃射をくわえ、最高速で離脱する』
台所の黒い悪魔も我々人類に対してこの戦法で挑んでくる事からも、きっと有効な戦法です。
多分、我が家の守矢神社では紅白と白黒合せて352機ぐらい撃墜されているのではないかと。

Title: The Black Devil of the Moriya Shrine
I continue still drawing this series after all...orz.
'Be the first to see the enemy plane, sneak up on him, ambush him, shoot him up with machine-gun fire from close range, then high-tail it out of there as fast as you can.'
The Black Devils in the kitchen use the self-same tactics on us humans, so they must be effective. Perhaps, in my Moriya Shrine, "the red and white one" and "the black and white one" shot down totaled around 352.

Pixiv TAGs: 'Erich Hartmann' 'Komeiji Koishi' 'Messerschmitt Bf 109' 'Gensou aerial war 1946' 'Touhou'

Ah, "Hartmann's Youkai Girl," that makes sense.