re zero: I stand on the million lives I've lived

Subaru, not the car brand, Dies for the 666,666,666,66 time upon reaching this milestone he is given the achievement one who does not fear death death upon receiving this he is given a system and is given another prize he can pick between
1. go back to ten days before where you first started in other words he can go back 10 days before the start of the anime
or
2. a Demon sword that absorbs the life of his enemy and makes him stronger
Subaru chooses,,,, sike u thought i was gonna tell you read it to find out .
Ps; i just started re-watching the anime and haven't moved onto the manga yet so coorect me if i mess up