Based off of the Sacrifice ending; Ib gave her life so Mary and Gary could get out of the Museum. While Ib lives how Mary used to, the other two live the life Ib gave them, until they realize what's missing. Getting Ib back was going to be harder than they first thought though.

As Akemi Homura travels through the different timelines, she never stops to think of the other Akemi Homuras who should've been in them, and who have to deal with the consequences of her actions afterwards. Semi-AU, a "what if?" introspection on the after-effects of time and space traveling. Oneshot!