The Last Man in the Universe UE

A man with a unique name, Ue (spelling; Yu), decides to accept an offer to join a program called 'Into The Hole' because he is bored with his life.
The program requires someone to be flown and enter a Black Hole which for thousands of years has always been a mystery to scientists.
This program is sponsored by Hidetoshi Akimura, who spent his entire life dedicated to studying a Black Hole which they named the Black Eye, somewhere in the Norma Arm, Milky Way.
While Ue is on his mission to the Black Eye, there is chaos on Earth, a catastrophe that nearly wipes out humanity.
The disaster was caused by the Healer serum, a serum previously touted as a miracle serum and highly revered by the public, now become a deadly serum that wipes out more than two-thirds of the Earth's population.
Can Ue complete his mission?
And what about the fate of the remaining human beings on Earth?
Find the answer in this novel.