YachiIro goodbye

いろは16 x やちよ20.
Iroha suddenly kiss Yachiyo with sadly face.
I: Thanks for helping me for a while. I have to go back to my city with Ui. This is goodbye.
Y: Will you back here again?
I: I don't know. I can't tell...
Y: Iroha, back here soon. I'm waiting for you.