Pandora: A Death Jr. Manga

From Seven Seas:

Death Jr. -- you've played HIS PSP game, you've read HIS comic! Now get ready as we turn the tables and shine the spotlight on a force as powerful as the son of Death himself -- his girlfriend!

Pandora discovers a secret portal that sends her to the future and into the body of her teenage self. Besides having to grapple with teenage angst, she must save the future DJ from his greatest enemy yet -- a snake-haired foreign exchange student with a deadly gaze and even deadlier intentions!