What's important about this episode is that it establishes how much Kai cares for Aki, even though he spends all his time playing KILL-BALLAD and apparently ignoring her. He's not hanging around her for no reason, that much is obvious. He has to be her onii-chan because Misa asked him to. Why he does so and what exactly it is that ties these three together will hopefully be revealed later on, probably when it would be dramatic to do so.
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