Game Shoshinsha no Mari-nee ga Iku VRMMO Nonbiri? Taikenki: Mebius World Online

At the recommendation of her younger brother who lives with her, Mari Akizuki decides to play the massively popular VRMMORPG "Mebius World Online." Being a beginner, she had only wanted to enjoy the game at a leisurely pace... But before she knows it, she ends up battling a boss monster, earning a rare skill, and becoming the center of attention?! And so begins the kind-hearted Mari-nee's VRMMO life, as she bonds with both players and NPCs alike!

(Source: Square Enix, translated)