Imouto wa GAL Kawaii – Episode 1 (ES)

Shohei Shindo, a dedicated otaku, suddenly gains a stepsister when his father remarries. Her name is Rino Mizusawa—a quintessential gyaru with striking blonde hair, piercings, heavy makeup, and a skimpy mini-skirt style that screams "gal." Shohei expects zero overlap with someone so outgoing and trendy, but now they're forced to live together as family. Rino struts around casually in just a bath towel, completely unbothered by her stepbrother seeing her half-naked, treating him with cheerful, sibling-like friendliness that throws the shy, embarrassed Shohei off balance. He assumes little sisters should be cute, clingy, and modest—not this confident, gal-tongued whirlwind. Living together proves challenging for the introverted otaku, until he discovers Rino secretly shares his anime and otaku hobbies, sparking real conversations and surprising common ground. One fateful day, an unexpected situation traps them alone in the bathroom. The tight, enclosed space heightens the intimacy; Rino's curvaceous body looks irresistibly alluring up close. Drawn in by forbidden desire, Shohei leans in and kisses his stepsister passionately on the lips, igniting the start of their taboo relationship.