Alright, I found an episode of the 2001 DVD release from ADV and Sakurako Haru looks correct:
http://i.imgur.com/4SpW577.png
About 平山周吉 I agree that it's a likely reading so I have no objection if you want to edit it in. I don't really like to go at random with long vowels (Shu/Shuu) and the previous links are about a writer that's probably not the same person.