あらすじ
"I'll teach you how to be a bad girl." As a high schooler, Ayumu's at a sensitive period in her life. She ends up being educated on adult matters by a bearded old man wearing a black t-shirt.
あらすじはAniListより（英語）。
マンガ
Oji-san ga Joshi●sei ni Warui Koto wo Oshieru Hanashi
ComedyRomanceSlice of Life