Jun is the greatest scientist among the current spacefaring humanity. As a member of the 17th generation of spacefaring humanity who abandoned Earth to roam the cosmos, he succeeds in developing a vaccine for space sickness. The sole purpose of his research was to awaken Kendrick, a first-generation space human from the 1st century who had been cryogenically frozen after dedicating his life to eradicating space sickness... but as Jun conducted his research, he secretly developed feelings for him. After the vaccine was developed and Kendrick finally awoke, something seemed a little off?! “Jun, I’ve been waiting for you.”
A single sentence uttered by Kendrick, who had been cryogenically frozen 16 generations ago.“How does Kendrick know my name?” Even as He thought, “That can’t be possible…” her heart raced as Kendrick approached him without hesitation. Thus began a romance transcending time and space between the two of them.(Source: Ridibooks, translated)
— Description from AniList community (anilist.co).