Better decrypt all images in img\pictures folder with something like Petschkos File Decrypter (online). Game really buggy: even when I play on original chinese version, I can't go furter in progress after unavoidable ntr scene with fat classmate. After spawn on health-checking hall, she can't go further because one girl is stands in the way, and the same problems I've encountered in almost every version lol. Better wait for final version or at least some update with virgin route...
v0.433
That bug not come from the game. It's because you load an old save that you played from older version. If you play from start then you can progress without get blocked.
It's common issue with developing RPG Maker game, when author have new update, he might add some key function in the story necessary to trigger an event, without that key triggered you can't progress. So, you either play from start every update to collect all key event or just wait until the game finish.
Fortunately, in this game, the developer already include chapter selection at start of the game (he might remove this function when the game finish). This function help you skip a part of story without need to play it. If you're already play every content in the previous version, when new update come out, you can simple choose the last option to continue the new story without need load any save.
This is the screenshot when I progress the health-checking hall (after the NRT scene with the fat classmate).
Also, after the NRT scene with the fat classmate, she get killed and respawn again, so basically she's still virgin. I don't think the author will let you avoid that NTR scene (because it's complicated to coding that).