Kimi ga Utsukushi Sekai to, Kimi no Inai Utsukushi Sekai no Koto

is a Japanese light novel series written by Natsumi Kanda, with illustrations by Achiki. The series began publication on March 9, 2019 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"Reset the world and come see me again"

One spring day, just after graduating from high school.

Immediately before that, I lost you and was disappointed, and I received a letter that seems to be you.

It seems that you have to find the most beautiful thing in the world to "reset".

I stumbled upon a wish and set out on a journey to meet you again.

The traveling companion is Crescent, a dubious cat-headed man.

As he guides me, I look for clues to "reset" and go around the places of memories with you.

The school building we spent together.

A mysterious coffee shop that I visited on a date.

A tree-lined avenue in a park with shining illuminations.

Then I will reach you again in the secret of "Reset".

――Please see the ending of this love with your own eyes.