Based on the title provided, this refers to a specific release by the artist Kahlua Suzuki under the YAKIYAMA LINE label/doujin circle. The title "Peach Girl 3" indicates it is the third installment in that specific series.
She was searching for Momo. Not the fruit. Peach Girl. The living girl who had wronged her. YAKIYAMA LINE -Kahlua Suzuki- Peach Girl 3 ENG
Core Conflict: Protagonist Momo Adachi navigates a love triangle with Toji and Kairi, while dealing with the malicious schemes of her "friend" Sae. Based on the title provided, this refers to
Without a name, Kahlua becomes a ghost on the train, able to see Momo’s true form: a girl named Yuki who died on the real Yakiyama Line ten years ago, clutching a love letter never delivered to her female classmate. Momo/Yuki confesses that she has been summoning lonely women to the train for decades, hoping one will remember her. Not the fruit