Responses
The nearest we have to this is Nights before nights
i assume you didn't read last bonus author's note since you didn't know but it's been existing for quite sometime now
http://www.mangago.zone/read-manga/nights_before_night/
thanks so much, takame san!!! ε=ε=(ノ≧∇≦)ノ thanks for sharing it!
after everything's clear that this is just an unfortunate mishap, may we know where in the world is haru san and shigure san's story? I won't mind a flashback ლ(´ڡ`ლ)