Release of the first volume of the Oreimo light novel series written by Tsukasa Fushimi and illustrated by Hiro Kanzaki.
The first season of Oreimo anime aired, adapting the early volumes of the light novel.
Second season of the Oreimo anime aired, continuing the adaptation of the light novel series.
Announcement and release of the Oreimo visual novel video game adaptation for PlayStation Portable.
Kyosuke and Kirino Kosaka grow up in a typical family environment, developing their sibling relationship before the main events of the series.
Kyosuke accidentally discovers Kirino's secret passion for anime, games, and otaku culture, which she had been hiding due to social pressures.
Kyosuke decides to help Kirino navigate her otaku interests and social pressures, marking the start of their closer relationship.
Kyosuke starts participating in the school's anime club to better understand Kirino's world and support her.
Kirino's involvement in otaku culture becomes known to some classmates, leading to both challenges and growth.
The siblings attend a major anime convention together, strengthening their bond and understanding of the community.
Kyosuke confesses his feelings to Ruri Gokou (Kuroneko), complicating the dynamics among the main characters.
Kirino admits her emotional struggles and reliance on Kyosuke, deepening their sibling bond.
After various misunderstandings and challenges, the siblings resolve their issues, affirming their support for each other.
Kyosuke and Kirino graduate from high school, marking a significant transition in their lives and relationship.
