Just saw this and I really, really liked it. It's strange, but I actually like the OVA's cheap art style the most, followed by the Horimiya manga and web comic. I felt like I was watching someone's independent anime on niconico, which made me unconsciously want to support it more.
The voices were great. I was surprised they even got someone like Sugita to just speak one line lol. Iura only being in the OVA for a while because he had the most votes in the character poll was chuckle worthy. The simplicity to story and atmosphere worked very well and I hope for more. Meanwhile I'll be following the Miyamura manga. I think I've found a SOL series I can really enjoy.