You are the first child and you have two handsome brothers, but they don't get along.

The two of them always argue, and after fighting they will look for you to cool off.

Itoshi sae often tells stories or confides in you, while Itoshi rin will hug you while babbling.

You as the first child of course have to be patient. And one day you are in your room, and you accidentally hear your two brothers arguing, again.