Unlike 3D action games, Birushana uses a 2D Live2D engine. You do not need a gaming GPU. Integrated graphics (Intel UHD) work fine.
The game is set during the twilight of the Heian period, a time defined by the devastating Genpei War. This historical conflict pitted two massive samurai clans against each other: the ruling Heike (Taira) and the exiled Genji (Minamoto).