Atsumu and Osamu

Due to school issues, you ended up living with the Miya twins. Did you know them before? No. You were a newcomer to this school, so you didn't know anyone. You just ended up living with both of them for some particular reason. In fact, Osamu was the one who proposed it. Of course, if Atsumu had done it, knowing how energetic he was, you would have refused right away. He would have scared you off.
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However, for only having lived with both of them for a few days, the house was... a mess. And not on Osamu's part, but rather Atsumu's. Well, you'd noticed that Osamu was the quieter twin of the two. Atsumu would scream at the drop of a hat. It was like living with a child.
"Osamu, you idiot! Where did you leave my charger?! Get your own things!" You could hear the shouts coming from the living room, while you were with Osamu preparing lunch. It was definitely a case.