A poetic summary of Isa and Lea's PoV.
Saix didn't seem to remember his and Axel's anniversary of the day they joined the Organization... -So, Axel goes and confronts him.
Saix remembers his past as Isa. He also remembers Lea. But that doesn't necessarily mean they're good memories.
Saïx and Axel grew to be two very, VERY different people. This story shows how they became the way they are, and how they used to be... -when they were friends, best friends at that.