Jokes aside, this arc though, the best one in ages I witnessed. I, myself felt very,very bad for Shiragami. I really wished that Kuromine could have helped, I can't do anything but feel very depress about it 😫
This may be an old comment, but single timeline time travel stories are actually the simplest. It's the same as a linear timeline, we're just seeing things in the order of a narrative instead of in the order of cause and effect.