Oniichan daisuki is a familiar Japanese anime phrase, combining onii-chan, an affectionate term for an older brother, with daisuki, meaning really like or love. It appears across anime, manga and fan-made clips as a shorthand for a younger sister character expressing devotion, often in a playful or romantic-comedy context. Online, short voice clips of the line circulate as reaction sounds for sibling jokes, crush edits and wholesome memes, keeping it recognisable even to viewers who have never watched the original scene.