In the middle of the school-day, on the second floor of the gym.
This is where the two came to skip class, and it's where their friendship began.
A story of two high school girls, playing ping-pong and chatting as they spend the heydays of their youth.

Adachi's looking for a quiet place to sit around while she's skipping class and goes to the second floor of the gym, expecting it to be empty. There she meets Shimamura, and their friendship begins.

The setting is a rural city in which kidnapping and series of murders are happening simultaneously. 8 years ago, a boy and a girl were kidnapped and brutally tortured by the hands of their perpetrator. The victims, the compulsive liar "Mii-kun" (the narrator), and "Maa-chan" (Misono Mayu) reunite and start living together, despite the fact that the recently reported missing children were within Mayu's apartment...

Ikagawa Tokage is a boy with a superpower. He has the the ability to change the color of his eyes whenever he closes and reopens the eyes. Kinda useless, right? Regardless, Ikagawa Tokage strives to strengthen his power in an effort to become the strongest and not have his power be nothing more than an arrow to the knee. With that desire in mind, he trains daily in an abandoned building in modern day Tokyo. But on one such day, he comes to what looks to be a scene of a crime and feels the culprit might still be nearby. Will he make it out of the abandoned building with a broken knee? Is there more to his power than meets the eye?

"I," an aspiring novelist who can’t land a hit, a normal college student. Kai Shouko, a female college student writer who produced a string of hits. During the welcoming party of our university, a naked idiot suddenly barges into my life.

Makoto Niwa moves to live in the city and meets his first cousin Erio Touwa at the house of his aunt Meme Touwa. Erio is no longer enrolled on the register of the school and is constantly wrapped in a futon. Erio claims that she is an extraterrestrial life.

We came from the far future, where most of the adults have disappeared as if they vanished into thin air and all of the children are managed by a few adults. To discover the cause behind human extinction and to evade it from that root cause... That's what we had jumped to the past for, supposedly.

A boy sitting in the seats of a movie theater fidgets with his cellphone. "Before aptitude or anything, trying to change the future with just five kids? You would think there's a limit to lack of planning," he typed on his cellphone.

The boys wonder if they had really come to the past. Why? Because, ever since they arrived, they haven't stepped one foot outside this theater.

Note: This manga is included as a bonus with the limited OVA Blu-ray disc.