Honkai Impact 3rd: The Eternal Pact Between Us

(Honkai Impact 3rd, Previous Era) + (One heroine: Elysia) + (No angst) + (Don't get hung up on gender) + (The protagonist can transform) + (Elysia gets her happy ending)

Who is Xi? He has many identities.

He is Elysia's partner, Kevin's close friend, a sparring partner for Kalpas, and Mobius's little lab mouse…

In truth, he has another, more secret identity he has never revealed to anyone: he is an observer from a higher-dimensional universe.

He has observed this world's course countless times, yet not a single timeline led to the perfect ending.

So he abandoned that identity and descended into this world in person, all to find a way toward a different ending.

When the world inevitably approaches its end, can the former higher-dimensional observer change the story's conclusion?

I've witnessed them fail too many times, but this time, humanity will surely defeat Honkai.

(A new author here. Thank you all for your support! Please forgive my writing if it's not very good!)

(This book is about fulfilling one of the author's dreams: a Honkai story without tragedy.)

(There are some original elements and a little OOC characterization. Please just read for fun, and if you enjoy it, that's even better.)

(The protagonist is a higher-dimensional life-form with both male and female forms (mostly male, so don't overthink it!))