Kimi wo Ushinaitakunai Boku to, Boku no Shiawase wo Negau Kimi

is a Japanese light novel series written by Natsuo Kanda, with illustrations by A chiki. The series began publication on January 10, 2020 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
"I want So-chan to be happy, so I can't do it."

Summer in my first year of high school. On the day when he finally realized his love, his beloved childhood friend replied. I am destined to become a vegetative state in three years. That's why I want you to be happy with someone other than yourself.

I got the chance to time leap to change my destiny. But it's such a cruel test that every time she fails, she regains all the painful memories.

The whereabouts of the sad love that I can't give up while repeating the bitter ending many times.

I'm sorry, Ichiyo. If you're next to me, I'll help you over and over again.