You can exchange on C-Cex.
For those wondering, there are a few reasons for its price rise:
1. New client in the works. https://github.com/BitzenyCoreDevelopers
2. New miner in the works along with new pools. https://github.com/ohac/wasmminer
3. Misc software goodies in development. https://github.com/monaco-ex/docker-bitzenyd
4. A new wallet (with perfect English version). https://bitzeny.jp/ https://twitter.com/zenywallet
5. Very active twitter community and tipping bot. https://twitter.com/zenyhime?lang=en
6. Collaboration with some sort of online game. https://twitter.com/ninjasoulprj?lang=en
7. Its recently active wiki. http://bitzeny.cswiki.jp/
8. An active mascot (ZenyHime) + cute Telegram sticker package. https://i.imgur.com/yzGzLtC.jpg
9. Active Telegram group.
10. Active forums. https://bitzeny.info
11. Web-shop accepting Zeny. http://zenyshop.jp/
12. Likely to be listed on Yobit by next week (5th Nov<). Other exchanges are in negotiation. https://bitcointalk.org/index.php?topic=877.9980
More importantly:
13. The success of Monacoin, another Japanese crypto currency. https://coinmarketcap.com/currencies/monacoin/
How's that for a transparent and documented coin review?