All 12 episodes from the first series of the anime based on the light novels by Tsukasa Fushimi, as well as four special OVA episodes. The story follows teenager Kyosuke Kosaka (voice of Yuuichi Nakamura) who uncovers a secret about his otherwise seemingly perfect younger sister Kirino (Ayana Taketatsu) - she is obsessed with collecting erotic anime and playing adult computer games. After not speaking for years, Kirino begins confiding in Kyosuke about her quirk, bringing them closer than ever before.