@Acolytus
Were we even reading the same manga? Yugami tried his best so that everyone in his group get to visit places they want to see, even went as far as made the schedule and route for it. Sure they got lost because of his "bright" idea to walk the shortcut, but then again, it's out of his control when suddenly wasps showed up and made them run in panic. And even after that, he went back and forth searching for his members. I don't think a truly selfish person will do those.
Rather than looking for something to blame, you should try to figure out what the author was trying to tell. This particular arc is about knowing yourself and your friend, open up to them, fixing mistakes, and to always focus on what's important.