Question! If I buy the normal ending will I still get the premium picture? Or do I have to do the entire route to get it?
You can buy the normal ending and then only read the last part in order to get the premium photo; you don't have to go through the entire route again :)But I'd still read the entire ending, Makoto has a really cute one :P
I still don't get how you can complete both endings for a character; do you have to go through the storyline/route twice?
In generic conditions, yes, you would have to read Makoto's storyline, or any other character, twice in order to get both endings. However, if you have 150 Jade at your disposal, then I'd recommend reading the Sweet Ending when you play through his actual story, then you can just buy the Normal Ending without having to go through the whole thing again. Read the Normal Ending and you'll get the prizes.