Tai Ari deshita.: Ojou-sama wa Kakutou Game Nante Shinai

Synopsis

From Seven Seas:
Kuromi Girls’ Academy is a refined, elegant school that expects the very best in deportment from its young ladies. Aya got into this peerless rich-girls’ institution on a scholarshipand hopes to grow as lovely as her fellow student and idol, the so-called “Shirayuri-sama.” But Shirayuri hides a terrible secret: she’s a trash-talking, combo-chaining, newbie-stomping, ruthless hardcore gamer! Could a mutual indulgence in no-holds-barred video game combat grow into a deeper rapport between these two girls?

Synopsis & details from MangaUpdates