Before I will go to the problem itself, I wanted to say: I'm amazed with amount of work you put into this game. It's really visible. I love the characters, love the art, almost everything.
However I'm a type of person who usually plays the game only once, because I'm choosing this option which seems natural for the MC for me. And I have a question about chapter 4!
I wasn't able to save Yukinari and I got bad ending (which was really nice written, I must admit), but I wanted to ask: was it because of my choices (don't help the child and hide)? Would it be different if I registered a figurine from Yukinari's and Natsume's room in chapter 3*? I'm asking because if it is the first option I will probably play again as "different Shuuki". If the latter I would just play as I played, but go back to save from chapter 3 and register the figurine...
*I didn't see any option of looking for mementos in chapter 4, so I'm just blindly guessing...