Yahallo is Komachi Hikigaya's signature greeting in My Teen Romantic Comedy SNAFU, the light novel and anime series also known as Oregairu, where she is the cheerful younger sister of Hachiman Hikigaya. The playful blend of a casual Japanese greeting and hello became closely associated with her bright personality and quickly caught on with fans. Clips of the line spread through anime edits, soundboards and short-form videos, where it is now used as a recognisable, upbeat hello far beyond the original series.