@evilpeach Not really, Kaho rocks, she isn't some annoying tsundere in denial... she might just loves Tsukimori to that point, same goes with Tsukimori, he choose music above all, while it's hard and pathetic for him, he makes a choice
but he should know the girl loves him that much, it's stupid to just abandon her so at least their relationship has to be solved in Vienna. Actually it's a good and romantic she could go to Vienna so she finally can see what world Tsukimori's live of (The author might plan for excuse to make Kaho goes to Vienna, in the end she might go there and stay with Tsukimori).