It's a visual novel.
It started out very slow, but very obviously building up to something serious involving depression, suicide, and/or self-harm.
It turned out to just be used to turn it into some meta bullshit about a yandere inside your computer, making the others kill themselves so that you have to be with her.
I don't mind spoiling it, because it's a slap in the face of everyone dealing with these things.
Of course, it was written by a man.