I was rewatching the first season of Oregairu the other day, and something caught my eye on the list of contacts on Hachiman's phone (which we see in episode 5, after Yui adds herself as a contact).
The list here is:
- Soubu High School
- Takatsu Dentistry
- Hanazawa Hanako (花沢華子)
So we have Hachiman's relatives; places he goes (school, dentist, barber); and now Yui. But who is Hanazawa Hanako? That's a girl's name - but why would Hachiman have a girl's number in his phone?