@Plagen Shiki Even though it sounds plausible and would probably what happens, I don't think I'll leave my young adult sister alone with her boyfriend for a week. Even more so if she's blind. A friend perhaps. Even okay if he has his family at home but I won't want to leave her alone with him.
@Whatever Like sure, irl. But this is the world of manga, where two adults with kids get married and then leave those kids alone by themselves in the house while the parents go who knows where, or where parents let their kids live alone all the time and never check in.