Fate Rewinder summary:

The world's most easy-to-understand and hot loop manga!An organization that saves people who have tragically died, the Space-Time Police Special Task Force, also known as the "Rewind Officers"! Their weapon is the time machine "Retry Eye" embedded in their right eye! Rewind time dozens, hundreds, thousands of times until you solve the case! The first loop manga in CoroCoro's 45-year history, a must-see!