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.

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...

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?