Hundreds of years from now, the last surviving humans discover the means of sending consciousness back through time, directly into people in the 21st century. These "travelers" assume the lives of seemingly random people, while secretly working as teams to perform missions in order to save humanity from a terrible future.

Ten years have passed since the discovery of inter-cosmic travel. The existence of three parallel worlds have been confirmed. What happens in one cosmos, even the slightest incident, can create a “butterfly effect” that influences events in the other worlds. In response to these discoveries, the “Dimension Police” and “Space Guardian Academy” are formed. The beautiful female investigator Ai is the Space Guardian Academy’s top agent. Along with her trusted android partner, Bridge, she has been assigned to eliminate the inter-cosmic terrorist group DOUBT. Amidst the struggle, Ai finds herself challenged like she never has been before when allies become enemies, enemies become allies, and the mastermind behind the evil plot is revealed.

Strap on HARD and TIGHT for the ultimate pleasure trip through LUST, SPACE, and TIME! Watch as forbidden time travelers journey through history and the "Final Frontier" of sexual pleasures. History has never been this NAUGHTY or this HOT in this trilogy of T&A TIME TRAVELERS.

i is a Dimensional Police officer who jumps into "Retro World" (レトロワールド, Retoro Wārudo) to hunt down the criminal molikan.com organization "Doubt" (ダウト, Dauto). There, she faces off against her former partner Yui, who now works for Doubt.

i is a Dimensional Police officer who jumps into "Retro World" (レトロワールド, Retoro Wārudo) to hunt down the criminal molikan.com organization "Doubt" (ダウト, Dauto). There, she faces off against her former partner Yui, who now works for Doubt.

Hatsuki is a highschool student living with her sister, Hatsumi, who she has a huge crush on. On Hatsumi's 16th birthday, she is suddenly surrounded by a green light and disappears in front of Hatsuki!She manages to follow Hatsumi with the help of a being resembling a fat baby chick (literally), ending up in a place called "The Great Library", which is full of different worlds stored in books. Hatsumi wasn't there, though, so the search for Hatsuki's great love begins and involves traveling from book to book.