Nee-chan no Tomodachi ga Uzai-banashi (Pre-Serialization) is a completed manga by Azusa Kina, first published in 2021. It blends romance, comedy and slice of life. You can read all 7 available chapters of Nee-chan no Tomodachi ga Uzai-banashi (Pre-Serialization) online for free on MangaPulse; the newest is Chapter 6, added 2025-09-08. The series is finished, so you can read it from start to end in one go.