[ o7 ] a code, a note
[[ Explanations: The numbers are obviously a code, but it should be breakable to anybody of moderate logic. It's a simple one that assigns a number to a letter, in order - but the problem is assigning which letter is the beginning one. In this case, it's "L" - notice in the top left, next to L's symbol, there is an arrow pointing there that says "starts" that would be a huge tipoff. Also, you could count which number comes up most frequently and put that letter to E, and then deduce the rest from there, but that would be ha~ard. Off the top of my head, some of the codes are "Memento Eden," "memento mori," "B, A, successors," "L, justice," "death, "shinigami?" and a few others I don't remember. The music one is a tad harder but uses the same system. The staff has five lines and four spaces - nine total. So each letter gets a number up to 9, starting again, with L. It spells his name, "After Always" - but you wouldn't be able to figure this out unless you were willing to go through quite a bit of trial and error or knew A's name to begin with. You can't really read it, but in the bottom left-hand corner it says "can I warn you / will you listen?" which is supposed to be unreadable. Wow this is long. ALSO: YES A HAS MY BAD HANDWRITING LOL! ]]
[[ General notes: warning to BB. Asks Anna a question. ]]