The Daily Life of An OP Heroin

Rira Arow reborn into a new world after accidentally touched a mechanism in the mysterious ancient tomb. The once kingdom's strongest warrior, now reduced to be a normal highschooler of the Earth. Her wishes to live a healthy, leisurely life before rebirth finally achieved. Thus, leading her into the world of an idle school student. But, was that simple to be a good student nowadays? Seems like someone looking forward to shed her vests one by one. Excuse me, who are you?