This is so good I come back and read this every couple of month when I start to get irritated with the lack of good writing in fanfics so kudos to you. Also this is beautifully written.

This is such a simple yet beautiful story. There are no surprises when you know the formula for these kinds of stories, so maybe I'm just a sucker for poetic endings and reverse-summons.

There is an art in telling a good short story. Making it Xpload In size is a brute force approach, but making all the necessary things fit into a small package takes skill.
I would certainly appreciate a longer story, but I can also appreciate the skill required to write a short one that's this good.

What if Zero went after Klein sooner... And then Strea showed up?

Very good. Louise referring to herself with her username after the time skip is a subtle, but powerful tool that helps to show her changed mindset.
Having Silica be the one spending time with the Black Cats is an interesting move, I like it.

gracias.

Mierda que buena historia

A little sad... I could think that 'Zero' lives in Alfheim and Gun Gale could be good, maybe mixing her world with the Fourth Arc [I sincerely don't know too much about the fourth arc]

Too bad they will never meet again, even if I wonder what could happened if Zero tried to 'Summon' again... Could she summon Klein? Could she summon herself somewhere?

Short, sweet, and an ending that tugs the heartstrings of all those who look for happy endings.

I wonder how Louise dealt with the transition to a new world, getting an identity (good to know someone who canonically can hack the citizenship registry), and learning about her new home. And maybe, just maybe, a little bit of magic will make it across and Yui may meet her Aunts, grandparents, and the rest of her family properly.

Ok. That was perfect. Nicely done :)

This was adorable and amazing and made me very happy to read it.

We need a sequel and or a side story. This is gold. I understand if you cannot write more of this ambrosia.

amazing fic. just goes to show that one doesn't need 1 million words to make a good work.

I still love this story, its one of the better Zero tales out there.

This was some good shit, I applaud your skill in writing. clap. clap.