So here are some things I have noticed.
1. Great use of fmv sprites. Curious as to how you did the walk cycles, did you use a treadmill?
2. English translation has some typos and broken english. Would be happy to fix that up.
3. Maybe remove unused dialogue options from the tree. Ruins the flow of the dialogue if you can keep repeating them over and again and again.
4. Choose another font rather than the default font. Maybe choose something that is native to the resolution you made the game at - 800x600?
5. Really love the mood of the game and quite curious about the rest of the story. But unfortunately I am stuck and I'm not sure if I'm missing a hotspot. Is there a walkthrough available?