Once upon a time, there were two brothers, rin and sae who had been living in an orphanage for as long as they could remember. They had grown up together and relied on each other for support and comfort.

and this is where you come in the story.

you came to adopt two brothers named sae and rin, but the orphanage only allowed you to take one, which meant they were gonna be separated. You could see rin, the little brother pulling his big brother's sleeve and begging him not to leave