Ore no Imouto ga Konna ni Kawaii wake ga Nai Portable

Ore no Imouto ga Konna ni Kawaii Wake ga Nai Portable is a romantic comedy visual novel developed by guyzware and published by Banpresto.

Unlike the original story of the light novels, Oreimo Portable expands on the story, with complete story routes for Kyousuke and each of the main female casts written by the original creator of the light novels, Tsukasa Fushimi.

The plot in Oreimo Portable acts as a spin-off to the light novels, which explores the relationship between Kousaka's siblings Kirino and Kyousuke. The story begins the year after Kirino's infamous "life consultation" with her older brother, who accidentally discovers her darkest secret: that she is an avid fan and collector of anime and eroge involving older brother-little sister dynamics.