Title: Ai Shimai Tsubomi… Kegashite Kudasai
Japanese Title: 愛姉妹 蕾… 汚してください
Synonyms: Immoral Sisters: Blossoming
Episodes: 2
Released Date: Jun 25, 2004 till Sep 24, 2004

Katori is attracted to an enigmatic new student at her University named Koshiro. She remembers his face from when he saved her younger sister from a band of rapists in the past. However, rumours abound that Koshiro is sleeping with his teachers, and has some kind of hidden agenda against the school and her mother. When Koshiro’s plan goes into motion, Katori, her sister, and her mother will all be in on the action.

(Source: ANN)

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Label: Pink Pineapple
Prequel: Ai Shimai 2: Futari no Kajitsu
Format: mp4
Uncensored

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Episode 1     
Episode 2