Ossena's Questions (2)

i'm loooking for a manga i read 2-3 days ago but can't seem to find, it's about a girl who get reincarnated as a vilaaines she start learning martial arts and at the end of the chapter i was (the last i think) she was in a mountain trying to catch a venomous snake. My description is so fck bad

i'm looking for a manga where the main characters his summons and have to kill the demon lord but he kill all his friends and when he defeat the demon boss he suceed but the ''system'' say he fail so he have to restart at the begining of his journey but he still is to cruel and have to restart. the manga begin when he have to restart