30-sai Moonna, Heisei Gyaru ni naru.

Aya, an unpopular 30-year-old office lady, has been regretting that her life would have been more enjoyable if she had debuted as a *gyaru* when she was a high school student... Aya, however, is able to go back in time to the year 200X and live again as a Heisei-era *gyaru* in high school! (Source: Kadokawa, translated via DeepL)