now Ep.2, Timeline:
前編:
Ep.1: Iris／Miina 堕落(without 悪の胎動 D.Iris,Miina)
https://e-hentai.org/g/2146995/db08ba66f4/
後編:
Ep.3: Himeka&Konomi 堕落
https://e-hentai.org/g/2147129/b1db8c8124/
Ep.4: Erin 覚醒
https://e-hentai.org/g/2147174/376f7060ca/
Ep.5: ヒロイン 堕ち計画 1 Erin&Karen
https://e-hentai.org/g/2147209/8c17321bf0/

artist:Koimin4
Pixiv:Koimin4
https://www.pixiv.net/users/1390006
Fanbox:Koimin4
https://koimin4.fanbox.cc/
Twitter:Koi min R-18
https://twitter.com/Koimin4

this episode collected from:
Yuuka&Ruri 堕落1
https://www.pixiv.net/artworks/93275573
Yuuka&Ruri 堕落2
https://www.pixiv.net/artworks/93645420
Yuuka&Ruri 堕落3
https://www.pixiv.net/artworks/93770925
Yuuka&Ruri 堕落4
https://www.pixiv.net/artworks/93821442
Yuuka&Ruri 堕落5
https://www.pixiv.net/artworks/93863111
GIF anime:
Yuuka&Ruri 堕落4.1 GIF
https://www.pixiv.net/artworks/93822805

Some images are cute, but it's out-of-order-like that it's hard to like.
Don't know if it's genuinely out of order, if there are flashbacks, if different "routes" are drawn and mixed in a confusing way, or another reason :/

Base +28

to uareader
the chapter (悪の胎動 D.Iris,Miina) in Ep.1 is a tipping point between (Ep.1~Ep.3) and (Ep.1~Ep.4). It's kind of hard to divide it to Ep.1 or Ep.4. I believe it's ok to leave it to Ep.1, because it tells the corruption of Iris and Miina then they turn to D.Iris and D.Miina. It might be good to make it connected to Ep.1.
I must say it's much more confusing when first time to sort the serie (the artist even has a old serie which has the same character).
For now in this story, Iris and Miina turn to D.Iris and D.Miina, then they start to "corrupt" their mates one by one (Yuuka & Ruri, Himeka & Konomi, Erin & Karen).
BUT it's most confusing when Airi shown in Ep.4(Erin 覚醒) undercover to corrupt Erin, I don't even know where does she come from (last shown in Erin & Airi 1(https://www.pixiv.net/artworks/91348924), which seems like that Erin is already corrupted to D.Erin, god how confusing). I supposed Ep.1 is the real start of the new serie.

Base +8

好棒啊！

Base +8