Man, I loved this. All of it. Just read it for the first time, and it was amazing. Straight into my favorites list, and I will definitely re-read it again in the future. Just so sweet and fluffy and cute and romantic.
The only thing, though: It's cute that Yamada is so naive and all, but sometimes she comes across as a complete sexual blank who has never once thought about sex at all prior to hooking up with Kase-san, and it can be a little jarring. But I still loved the series and hope there will be more in the future.
Also: I kept hearing Kase-san's name in this guy's voice:
The Glorious People's Republic of Kase-san!