[Haruki is nothing if not pragmatic. He can open that with his left hand alone, even if it requires a little effort -- he's training to be ambidextrous. When he opens it he would smirk or give a dopey grin, but his jaw is part of what's shot, so he nods and gives a thumbs-up with this left hand. He could slurr out a thanks, but this is a expected of Rena as a member, so she doesn't get a thanks]
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