Volumes one through five each contain two episodes from the series and comes with extras, such as bonus songs sung by various voice actors for the characters.

In 2012, the world is invaded by aliens, and time travelers like Fumiaki are sent back to the year 1999 to prevent apocalypse by destroying the Nostradamus Key.

In order to find the Key, time agents were provided with specially created cell phones.

[10] Hope Chapman comments that "it's still incredibly entertaining in a pure, enchanting way, a little reminiscent of the most humorous bits in Mamoru Hosoda's films".

[11] The previews with scenes from the next episode featured hit music from the latter 1990s, sung by female characters in the video.