This reminds me of "Thirteen Reasons Why" which was a great book. I think that your is a smidge different, but I can't wait to see what it ends up being.
I think this is the most sad - yet adorable story I have read on Mibba, I wish that I could leave a diary behind for someone to read, especially a specific somebody, but knowing my luck someone else entirely will pick it up and read it.
I can definitely see you know you're doing and that's great, not many people can write a mystery quite like this and keep up with the same pace, keeping people still interested and intrigued to know more; I'm definitely going to wait for more updates!
I especially adore the layout, where did you find it? :)
Great work. This story is unique, and so far I really like it. I like the way you described how he was feeling, you definitely got that emotion across. My only critizism is that we don't know what he looks like yet. You'll probably bring that up later, but other than that, I can't think of anything to nit-pick about.