Alright, with how overwhelming the voting was, I closed the poll already. Our winner is 時をかける少女! 
We will be reading the version with this cover (Tsubasa Bunko version). You can buy a different version of course, but it will be a little tougher to reference what page you’re reading.
Where to buy:
Amazon: https://www.amazon.co.jp/dp/4046310073
CD Japan: CDJapan : Toki wo Kakeru Shojo (The Girl Who Leapt Through Time) (Kadokawa Tsubasa Bunko) Yasutaka Tsutsui, Hiro Kiyohara BOOK
Amazon eBook: https://www.amazon.co.jp/dp/B00IUAYHXI
eBook Japan: 無料まんが・試し読みが豊富！電子書籍をお得に買うならebookjapan
Bookwalker: 時をかける少女 （角川つばさ文庫） - 文芸・小説 筒井康隆/いとうのいぢ/清原紘（角川つばさ文庫）：電子書籍試し読み無料 - BOOK☆WALKER -
Learning Vocab:
You can create an account on floflo.moe (thread) to learn the vocabulary in the book ahead of time (or while you’re reading):
https://floflo.moe/toki-wo-kakeru-shoujo-tsubasa-bunko-ed/
Next Steps:
Sometime this week I’ll create a home thread for the book. There I will propose a schedule and start date and set up polls to make sure everyone is okay with that.