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Note: I think it's pretty self-explanatory when this takes place.
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"What's the matter Tsuna?" Kou was surprised at his friend's reaction after reading the contents of his grandson's letter. He had never seen anything that surprised this man before, not even guns pointed at him would make him feel anxious, rather it just made this crazy friend of his even more excited.
Kou wasn't one to shy away from danger but he was like a child compared to this friend of his. Tsuna would of course deny this and say that he would react just like a normal person if he thought it would be dangerous. This unbelievable statement just made Kou even more confused as to what Tsuna would even consider as 'dangerous'.
"If I'm not mistaken… your grandson isn't even a decade old yet right?" Tsuna picked up his pipe from the ground and faced his old friend. What he read was something he thought had been unbelievable.