Arata naru Sekai: World's/Start/Load/End

* A mixed-media project by Iruma Hitoma, who wrote the novel, created the story for the manga version, scripted the anime, and penned the lyrics for the music.

A time researcher and a group of children in a depopulated world find themselves stuck in time.

In order to save humanity, some of the characters are chosen to travel to the future (depicted in the anime), and others to the past (depicted in the manga), while those who are deemed unsuitable for the technology stay in the present (depicted in the novel).