Sword Art Online Alternative Gun Gale Online, Vol. 4 (manga)

In the real world, college student Karen Kohiruimaki lived an unhappy life,
self-conscious about her considerable height. But inside the VR game Gun Gale Online,
her avatar is on the shorter side-just the way she likes it-and each new day brings
something exciting! One day, she's invited by her in-game acquaintance Pitohui to join
the Squad Jam, a team battle tournament, and after some hesitation, she decides to
join, forming a team with M, one of Pito's friends. But when M betrays her, leaving her
to fight alone, how will she fare against the final team...?