512 was the ace System of the Rescue Department. It had handled countless Hosts, and its collection of S-rank ratings was vast enough to form a starry sky.
But the Hosts in its department were hopeless. They lost their hearts while carrying out missions. Instead of being immortal Hosts, they ran off to little worlds to live sweetly ever after with those poor, unfortunate souls. As a result, the number of Hosts in the Rescue Department stayed stubbornly low, and more Hosts joined the department than ever left it.
At last, one day, the Main God stopped sending people into the Rescue Department's bottomless pit. After all the Systems discussed it, they decided to send their ace, 512, into action.
(512: I really can't thank you enough.)
P.S. A collection of individual stories, with different couples appearing in each.
Premise: I'll think of one soon
