If I could do it all over again...
Holo, who believed that he had an unfortunate constitution, felt that he had killed his best friend since childhood. In despair, he signed a contract with God to go back to the past five years ago and had the ability to burn his life to briefly rewind time. But the causal connection never ceases. Just like that butterfly, it doesn't know what unpredictable consequences flapping its wings will bring in the future.
Intention: time travel