While Hachiman is at an elementary school with Isshiki recruiting kids for the Christmas Collaboration Event, he happens to find a girl that seems a little lost, who is waiting for her sister. Saki shows up to get her, and Hachiman briefly thinks that the girl could be Saki's child. Saki introduces Keika to him, who starts calling him "Ha-chan".
Later on Hachiman notices Saki at the Christmas Event watching Keika.
Addressed / Nick names