Hi.
Just tried out the current public version at the time of this post and I wanted to leave my impressions. Overall, an AVN, through and through. Lots of text and art, kudos on the models, with chubby Otabe and the player Ryo and so on. I particularly appreciate the care in trying for not going over the board, with realistic facial expressions instead of pouts that can only be pulled off with injections of botox on the lips. How Misaki's annoyed expression is a puffed-up left cheek, or Otabe's creepy right eye being visible through his glasses (as I type this, I just remembered how Ikari Gendo from the anime series "Neon Genesis Evangelion" was drawn similarly, heh).
As for the story, it seems to me that you're going for the full tragedy with this couple; I confess, when the full version is released, I'll likely go for the most lewd run first, mostly to get a general feel of the plots, but I'm willing to bet that the "best" version will be going for the pure-est love run with Misaki and Kohei.
(also, the wickedness, so to speak, of Sayaka's relationship with Takeshi and all the ways it might turn out with an invested Kohei? Devilishly tempting!)
The NTR is the main theme, but I wonder if you're planning to have a way through the game so that the three contesters, Takeshi and Ryo and Otabe, can be redeemed? Personally, I think that would definitely contribute positively for the pure love run (I assume there will be one as it's typical), but that's merely my opinion.
Regardless, I'm confident that you'll be able to pull a great AVN, so I'm following (actually, since you first submitted this game here on itch, IIRC >.<'' , it got me curious but at the time I hadn't a better feel for it so I didn't leave a comment).
Wish you the best of luck with this project of yours, and that you'll have a great time developing it!
Cheers!