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A Sister's All You Need. Complete Series contains anime episodes 1-12 Shin Oonuma. Itsuki Hashima is kind of a disaster. Between struggling to meet deadlines for his novels and being constantly bothered by his friends, he has one oddity that makes life even more difficult—he’s obsessed with little sisters! Luckily, he has his younger stepbrother, Chihiro, to look out for him. But there’s a secret that could completely change their relationship. Special Features: Original Twitter Anime, Textless Opening & Closing Songs, Trailers