she has been active in the entertainment industry for several years. Asae Ōnishi is best known for her roles in various Japanese films, television dramas, and stage productions.

She gained recognition for her performance in the film adaptation of "1 Litre no Namida" (1リットルの涙, "1 Litre of Tears"), where she played the leading role of Aya Ikeuchi. The story, based on a true story of a girl suffering from a degenerative disease, was heart-wrenching and earned Ōnishi praise for her moving portrayal.