you guys are missing some core things.
first is: satoshi being NTR'ed by the gal it's not even possible because it would require some emotional connection between them, and after two traumatic experiences it's extremely unlikely. it's way more likely that he'll become misogynistic.
second is: I don't think that he'll become a DQN quickly nor that it will be a wholesome story...
I put my bets in Netorase, satoshi being in the DQN social circle, and watching how things work.
edit: that's the Summer Episode ( v1.2 / Bonus Content). the background appears to be Kujo's house, it's likely that she's his mom since it's said that it will also be a mom NTR, it's also said that is a completely different story from the first 3 episodes, I bet that's a story about how Kujo was mom NTR'ed and also was abandoned. the thing is that there's more and more evidence that revenge will be at least one of the branches.
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