There's a Ghost Behind the Gyaru (Pre-Serialization) is a completed manga by Hashimoto Kurara, first published in 2020. It blends comedy and slice of life. You can read all 7 available chapters of There's a Ghost Behind the Gyaru (Pre-Serialization) online for free on MangaPulse; the newest is Chapter 7, added 2020-09-28. The series is finished, so you can read it from start to end in one go.