Known to Kyousuke as a man with the appearance of a Yakuza member and the aura of a gorilla [1] , Daisuke is a middle-aged man with tanned skin, swept-back hair and a face with well-defined features. He also sports a menacing glare behind the frameless eyeglasses he wears. When at home, he is always dressed in a traditional Japanese yukata and is occasionally seen drinking sake, especially to calm himself down in a tense situation. Daisuke is a very strict parent to Kirino and Kyousuke, especially towards the younger sibling Kirino.

He has a distant relationship with his Kirino , who always treats him rudely. Feeling that this will never change, he adapts to her attitude by changing how he thinks of his sister, treating her like an acquaintance. Kyousuke's dynamics with his sister suddenly changes when he finds one of her adult games by accident and learns that she is an otaku. Through this, he tries to be a supportive older brother while realizing he himself knew very little about his sister, such as her being almost flawless at school and working as a model.

Kyousuke 's younger sister and the youngest of the two siblings of the Kousaka family. She is an overachiever who seemingly lives a perfect life and is idolized by almost everybody. However, she keeps a big secret to her family — that she is an avid otaku and a fan of adult-rated games, especially those involving brother-sister dynamics. Kyousuke's discovery of this secret led Kirino to introduce him into the world of an otaku , and eventually, allowed him to reestablish his role as an older brother to her. She is voiced by Ayana Taketatsu.

Oreimo [a] is a Japanese light novel series written by Tsukasa Fushimi , with illustrations provided by Hiro Kanzaki. The series includes 15 novels released from August to September AIC produced a episode anime adaptation in , with four additional episodes streamed online in A-1 Pictures produced a episode second anime season in , with three more episodes streamed online later that year.