Originally split into 8 parts/books. Eren is written as a girl in this (although she(?) looks the exact same and the characters acknowledge that she(?) doesn't look much like a girl ...)
Author was previously on pixiv (https://www.pixiv.net/en/users/932066) and Twitter (@amanen_t) however they have since deleted all of their accounts.
English version scanlated by higasa (now himiko) on tumblr, however they have since deleted their copies as well. This is also why part 7 is in Korean as those are the only high quality scans for that part intact. If anyone has any further info about the author and/or any original or higher quality scans of this series, please let me know!