There is another doujin - '(C89) [Ponpon-O (Mountain Pukuichi)] Futari Nara
(C89) [ぽんぽんお (マウンテンプクイチ)] ふたりなら' - (not yet translated), plus more.

There is also a tank for this now:

https://twitter.com/pukuichi/status/720920556153909248/photo/1

http://www.amazon.co.jp/ebook/dp/B01E5LPL1M/ref=tmm_kin_swatch_0?_encoding=UTF8&qid=&sr=

I really, really liked the anti-bullying story, but I don't know if I'll like the direction the story went in...

Do you know if anyone is working on translating this one?