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I've said it when I saw it in the anime, but I'll say it again: it's incredibly adorable how Akito now sees Sana as his only source of comfort. When he was in his sister's presence, he was nonchalant and seemingly apathetic, but when in face of Sana, he broke down and showed how he truly felt — he feels trust and comfort in her, and that's really adorable! I love it!