Then doesn't that give you all the more reason to be optimistic?

[ tsubasa pauses for a minute, taking her time to think about the likelihood of koyomi suddenly appearing. the chances were slim. at this time, she wouldn't mind if it were even hitagi. so many people had friends and family coming and staying - but tsubasa had nothing. it was something that made her feel a very strong emotion.

envy. ]

If someone has been here before, then the possibility of them returning is very likely. Especially with the way this world functions..