[A live-action adaptation of the monster manga series, which has sold over 400,000 copies!] By chance, he bumps into his girlfriend's younger sister, Sakurai, whom he had only met once before, in the city. She has huge breasts that are nothing like her (her older sister's) and an extremely seductive miniskirt... if a female student had them, she'd be unstoppable! The protagonist, who is treated like a pervert by this eye-candy girl, follows her orders and visits a love hotel to clear the suspicion... but the test that begins there to prove he's not a pervert is far too much to bear...! Dirty talk, leg jobs, titty fucks, and sex. His reason breaks down as he is subjected to a barrage of erotic attacks that make it impossible to hold back from ejaculating! "Destroy all of your inferior sperm, you creepy brother-in-law! View "Byu" collaboration with popular doujin works! The original doujin work is ⇒ "Her sister is a big-breasted miniskirt JK with a devilish personality?" "Her sister is a big-breasted miniskirt JK with a devilish personality 2"