Is it even possible to beat the Dark Hour?

[Because Ken promised myself that he wouldn't dare go back anymore. He wouldn't allow himself to keep wallowing in misery after everyone knew what happened to him. He just couldn't. And yet, he can't help but feel nervous.]

I don't know why Ikutsuki-san wanted to do that but I do know that I want to beat it too. I don't even know where to start...