When I Had One Month Left to Live

Inui Yujin is a university student researching ghosts. One day, Yujin experiences chest pain and goes to the hospital, where he learns he has Kildess Syndrome, a disease that cannot be treated under current medical law, and that he has only one month left to live. Shocked, Yujin falls into despair and attempts to commit suicide by jumping, but is stopped by a beautiful girl who appears out of nowhere. With encouragement from the beautiful girl who introduces herself as Kubo Airi, Yujin recovers... but...