JK ga Toki Tometemita Ken

Marei Tokitou is a perfect, beautiful, rich, and prim high school girl (*with chuunibyou syndrome) who suddenly awakens to the power to stop time. However, although a month has gone by, her peaceful days have not turned into intense manga-like days, and she has grown bored, but...!?

(Source: Shueisha, translated)