You can skip most of Himiko's content. I'm not a fan of hers as well and my last playthrough of Week one had me skipping almost all of the ecchi scenes with optional menu prompts.Strange, I played the game for first time and was all okay, even finished the week.
Now I play again and the game get error in the sms scenes, with or without DM patch is the same.
Edit 1: Nevermind, I fix it.
Edit 2: Jesus christ Himiko is not some of my tastes, at all... i wish I can just avoid her the entire game