I've been trying to find this manga that I read ages ago and I've had no luck! I can't remember much, but I know it was really good. I vaguely remember there's a mysterious guy and girl and the heroine joins them, and she later finds out that the girl is actually a guy crossdressing in memory of his dead sister? I know this is extremely vague and there are probably of manga like this, but its been really bothering me and I know I would recognize it if I saw it! Thank you!!!!