I dunno. In this thread, which contains a prologue to Mendacium, the author kinda elaborates on his reasoning. (emphasis mine)The idea that Hanako would decide that Hisao's not good enough in bed (well, OK, that part I can see, but I think she'd bottle it up, rather than find an outlet for her sexual urges with someone else), and as soon as she got a little confidence, she'd go pick up a "bad boy", is extremely problematic, and hints towards the author having some rather misogynist viewpoints. It's a common sentiment among the self-proclaimed Nice Guys (uppercase intentional, read the linked article) that feel that they're entitled to sex for being nice, that women automatically go for "bad boys" and hate nice guys (lowercase intentional).
The thing about Mendacium isn't about how Hanako became more confident, but rather about how she became more social while still retaining her insecurities.
Mendacium itself also was based on Hisao's similar kneejerk reaction, which included assuming that she did those things just because she wanted the dick, as well as the slightly more relevant kneejerk reaction in assuming that she is destined for trouble if she should ever become more outgoing again. A.K.A. white knighting.
I tried to make the same thing evident in this fic as a potential setup to the apex where she decides to do something drastic to wipe away those insecurities, by showing that if Hisao finds the resolve to stop being a useless piece of shit, Hanako will notice enough redeeming qualities in him to not consider seeing someone else for the "support" she desires.
So she is, at this point, not particularly introverted, but still insecure. If my dialogue failed that criteria as well, then I guess I've got work to do.
Long story short: the author simply doesn't like Hisao as a character.Excuse me if I'm wrong, but did Hanako ever say ingame that she had some good reason for liking Hisao? The itty bitty neurons in my head are saying no, so I have little reason to believe that she wouldn't attempt to "upgrade" unless given a good reason not to.
About the story itself...the writing itself was pretty well-done and the sound system was a creative idea, if a bit cumbersome. As far as the story itself goes, my thoughts echo Nemz', Oddball's and Bagheera's.
- Hanako cheating on Hisao in itself wasn't a premise that was completely unbelievable, but the circumstances as mentioned in the story were. The "raging libido + upgrade"-excuse just seemed extremely shallow. If she cheated for emotional, rather than physical reasons, that would have been a lot more interesting. (though it's unlikely a high school relationship in its early stages would run into that problem)
- Of course, Hanako's capable of sinning; she's human after all and the flaws and insecurities she shows in the game give writers plenty of material to let her make some spectacularly bad decisions without it coming across as OOC. Unfortunately, the motivations for the affair were so nasty, it basically made Brogurt's Hanako irredeemable. This wasn't just a single act of indescretion...it was systematic adultery that could have easily continued for a long time. One of the reasons, lack of skill between the sheets, seems extremely shallow especially in light of the epic fail that was their first time. What's worse is the "upgrade"-motivation. The sub-human argument isn't just deeply condescending towards Hisao, but also to Lilly and to all the other people at Yamaku and that argument (which goes against the very aesop of the game) is what destroys the possibility of redemption.
- Despite the above, the story attempts the redemption anyway. If you go with the thought that Hisao is indeed a worthless excuse for a human being, the ending makes sense. Hanako's given Hisao another chance to be better than what the author perceived him to be, so maybe in the future Hanako won't be forced to try an upgrade. For someone whose view of Hisao is less drastic, the ending doesn't resolve anything. Hanako was simply sorry because her affair blew up in her face. The sex is still lousy and the matter of Brogurt's Hanako considering her schoolmates untermenschen wasn't addressed, so it wasn't resolved.
- The rape was just there as a shock element, not because there it added something to the story.
So yeah, the story's technically sound, but the premise and the way it was executed killed it.