So like um based on this picture

So like imagine this. Shuichi and Kokichi adopted Sou. Sou got his habits from Kokichi. Rantaro also adopted a kid, his name is Keiji. Sou and Keiji used to hang out all the time as kids but eventually Rantaro and Keiji had to move away. But the two boys promised to meet each other again when they were older.

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