Takumi Kitamura

A shy high schooler in Kyoto meets a man claiming to be his future self, who tells him he’s hacked into the past to save their first love.

In the town of Saima, when summer is about to begin, a group of six high school students intend to live a secret adventure by spending seven carefree days in a ruined mining facility.

Shy outcast Kokoro has been avoiding school for weeks when she discovers a portal in her bedroom mirror. She reaches through and finds herself transported to an enchanting castle where she is joined by six other students. When a girl in a wolf mask explains that they have been invited to play a game, the teens must work together to uncover the mysterious connection that unites them. However, anyone who breaks the rules will be eaten by a wolf.

Follow the friendship between the Nobara family's pet dog Shiro and a "small dinosaur". Their connection helps the growth of Shinnosuke and the Kusakabe Defense Squad.