If you make a wrong choice on Tatsuki route, it is revealed that he is an android created by Shigure, who then attempts to kill Hiroyuki now that he knows. Tatsuki self-destructs in front of Shigure, saving Hiro and destroying the building.Then the game asks you to reload a previous save.
Shin's rape scene in his worst ending. It's quite awful, especially if you've already gotten Shin's good/Best ending, because you're basically violating your childhood friend who always loved you. You are a HORRIBLE PERSON, you MONSTER.