noun
killer app; system seller
Refers to a video game or software title so compelling that it drives hardware sales. Wasei-eigo from English 'killer soft(ware)'.
wasei-eigo (Japanese-coined English), from killer soft(ware)
あのゲームは本当にキラーソフトで、発売と同時に本体の売り上げが急増した。
That game was a real killer app; hardware sales surged as soon as it was released.
Without a new system seller, the next-generation console will probably struggle.