Ashita, Boku wa Shinu. Kimi wa Ikikaeru.

is a Japanese light novel series written by Maru Fuji, with illustrations by H2SO4. The series began publication on February 10, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Akizuki Sakamoto is floating at school because of his scary face. One night, he encounters an accident scene of a strange girl and is forced to make the ultimate choice from a mysterious person.

"Would you like to save her life for half your life?"

Akizuki was supposed to have saved the girl "Yumemae Hikari" in exchange for her life, but for some reason his body was taken over by Hikari's personality every other day!

An exchange diary life of two hearts that has begun. The mischievous personality of light attracts tongue-in-cheek situations and people, and changes Akizuki's low-flying life! However, with the appearance of a transcendent handsome man who knows the past of light, it becomes a big incident that tells Fuunkyu.

A personality hijacked youth story of "I'm lonely" and "Unfortunate girlfriend" that can only be touched in the exchange diary!