[ they have a better grip on human connections than swords do... but as he watches kiyomitsu make tsun flappy motions with his hands, he just gives him this Knowing Smile. if he doesn't want to embarrass himself, then rindou will embarrass him instead, because that's what wholesome friendship is all about. ]
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Ah, so he's your childhood friend.
[ YOU'RE WELCOME!! ]
By the way, what does he look like?