Karen Kohiruimaki’s college life in Tokyo hasn’t been as she had hoped, due to her insecurity about her height. She comes across Gun Gale Online and, as LLENN, she becomes known as a “player killer.” But then, another female player aims a gun at her…

Squad Jam will be held on Gun Gale Online's Japanese server. LLENN wants to participate, but her favorite artist has a concert the same day. But when she can't get a ticket, she joins the tournament. She and her new partner, M head for the battlefield.

Almost one hour has passed since the team battle royale, Squad Jam, began. LLENN and M are still going strong on the battlefield. Being in a favorable situation, LLENN lowers her guard, which is when an enemy team launches a surprise attack.

An hour and 15 minutes have passed since Squad Jam began and only two teams remain. LLENN and M are one of them, but when M has an unexpected breakdown, LLENN heads for the last battle alone.

It's Spring break for Karen, and as she returns from her hometown back to Tokyo, she gets a very unexpected guest.

The second Squad Jam is about to take place. This time, Karen’s friend Miyu Shinohara will participate as well. She converts her character from another VRMMORPG and starts Gun Gale Online as Fukaziroh. LLENN takes her to go buy weapons...

The second Squad Jam has begun. LLENN and Fukaziroh’s starting point is the most northwestern area on the map. LLENN looks for Pitohui and M, but their location is far, far away. LLENN and Fukaziroh begin their advance towards Pito’s team, PM4.

The teams that have come together to defeat Pitohui’s team, PM4, begin their attack. Meanwhile, LLENN and Fukaziroh head to PM4’s current position. They take the shortest route through the dome before them, but realize there are three enemy teams inside.

LLENN receives some unexpected help during her battle in the dome that results in a change of tactics as she continues towards team PM4. M is surprised to see team SHINC approaching, and Pitohui learns that her ruthlessness can have consequences.

The climax of the second Squad Jam begins. With the defeated rival team members and the audience watching, the confrontation between Llenn, Pitohui and M starts.

At last, it’s the finale of the Second Squad Jam. LLENN and Pitohui’s one-on-one combat has begun. How will their fight end? Who will win the Second Squad Jam? And will LLENN be able to save Pitohui’s life?