some clarifications :
this is actually chapter 2 in this serie .
this chapter : silent hall / troll post of yoriko . release date at page 40 : february 2019 . this is chapter 2 .
the chapter : water purification plant / the "girl" with glowing marker on her butt . release date at page 20 : april 2019 . so that chapter is actually chapter 3 .
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page 1 of this chapter : the translator made a mistake and called this with " the 3rd chapter " .
page 4 of this chapter , only the "girl" , from chapter 1 , appears . so this chapter is a direct continuation of chapter 1 .
page 10 :
i guess these are vending machines that sell p0rn DVDs or p0rn books .
page 14 :
this "girl" wears nearly the same costumes as the ones in the last chapter of the serie nikubenki / nikuben hime :
https://mangadex.org/chapter/43a4ab62-7c74-4cbe-b51c-6dade472da21