What happens when an esteemed regressor hunter becomes a regressor?  Regressors. People that have gone back in time as their younger self after experiencing death while retaining all of the memories of their previous life. Only one of the multiple types of irregulars yet the most dangerous one.  Hans, a top notch regressor hunter gets sent 15 years into the past after being killed while protecting his wife from a revenge seeking regressor. If that wasn't enough he returns to the day he joined the regressor elimination agency.  He now has to flawlessly pretend to be his former self or be killed on the spot. Will he be able to live a normal life or will he be taken out by one of his own? In a merciless world where the smallest mistake could signal his death, only time will tell.