Once upon a time, an unidentified enemy, the Unknown, suddenly appeared. The Super Evolutionary Railway Development Agency, had developed the Shinkalion, a robot that transforms into a bullet train, as a countermeasure against this threat. (Source: Official Website, translated)

After waking up in her room on Christmas Eve, high school student Ryouka Tsurumi makes a series of chilling discoveries. Her mother informs her that her mansion has been evacuated and the area placed on lockdown due to the presence of an unknown and dangerous entity named X. The only other person left in the building is Shuuhei Murosaka, Ryouka's childhood friend. To add to the horror, Ryouka learns that X can brainwash people for its gruesome goal: feeding itself of human blood to reproduce. However, Shuuhei comes to Ryouka's rescue and manages to save her from one of X's brutal attacks. As the two friends try to escape from the lockdown area, they are captured by hypnotized humans and subsequently devoured by the giant beast. But for Ryouka, the nightmare has just started: she wakes up for the second time in her room, only to find out that a different X is now threatening her life. Realizing that she is stuck in a time loop, Ryouka decides to team up with Shuuhei to find a safe future away from the threat of X.

A new tournament, Squad Jam 3, has been announced in the popular VR game Gun Gale Online. This time, Pitohui, one of the best performers in the previous competition, offers to team up with Karen Kohiruimaki, better known in-game as LLENN, the Pink Devil. Despite her initial reluctance, Karen agrees to join Pitohui's team, LPFM, since she looks forward to facing SHINC, her rivals from the previous Squad Jam. The newly formed LPFM enrolls in the tournament and is quickly recognized as the favorite to win due to the caliber of its players. As they strive to come out on top and win Squad Jam 3, LLENN, Pitohui, and the other members of LPFM battle against other competitors and tackle unexpected challenges.

The night of a family birthday party. The mother is tired from work and wants to drink a beer as soon as possible. The father is fidgety and keeps an eye on the clock. A little girl is excited about the sumptuous meal and runs around the house. The intercom rings. There, a new family member is standing there... (Source: Official site, translated)