Responses
HAHAHAH!! I thought the same （╹◡╹）but, Ive read the raws and Yui is a girl (^_^;)
I cry....
Awww （ ; ; ）BUT, maybe it'll be a side story with Yui and she actually ends up begin a he ( ° ʖ °)
I have a theory that Yui is a dude. Like maybe it's just me, but let me explain!
Notice how Yui has short hair, that like a male? Maybe this is just the authors lack of skill in drawing long hair, but NO, OTHER GIRLS HAVE LONG HAIR! Then I thought it's probably just a coincidence, but maybe not. My next reason is that she has no tits.
http://www.mangago.me/read-manga/akai_ito_no_shikkou_yuuyo/nmt/c001/16/
http://www.mangago.me/read-manga/akai_ito_no_shikkou_yuuyo/nmt/c001/9/
And look at her neck, it's very similar to other males in that manga.
Now look at both Kei and Yui's close up shots.
http://www.mangago.me/read-manga/akai_ito_no_shikkou_yuuyo/nmt/c001/17/
http://www.mangago.me/read-manga/akai_ito_no_shikkou_yuuyo/nmt/c001/30/
Their face stucture is also very alike, and Yui's sort of drifts from the usual female.
This could just all be me grasping at straws and some people probably think I'm a just a crazing fuck, but hey, what can you do? ╮(￣▽￣)╭ I just wanted to know it anyone agrees.