Found it. You should fix the "Unable to find file audio/bgm/sad piano music...." It should be named "♩♫ Sad Piano Music ♪♬ - Solstice (Copyright and Royalty Free)"
Now how to get the Second Ending? I looked and tried every think I can think of.
Second ending is really a very very VERY optional ending, kind of like a "secret ending", so i'm not really interested in going so deep into it. you can totally get it before you even make dinner, so try to interact with everything that won't kill you! ((hint hint: if you've looked around the house enough, you should notice something with Henry's family. there's something in Henry's room that is definitely important to that story line, maybe after you check everything you should investigate))
what's strange about the music file is that it's fixed for me. I'm gonna try and reupload the game and hope it gets fixed, i'm so sorry about that!