Graffiti (MATSUMOTO Izumi)

(from ebookjapan):

A collection of Izumi Matsumoto's early works. Ryunosuke Tachibana is on his way to the U.S. to become a Hollywood star, when he stops by Shanghai and is given a mysterious pendant by an old man on his deathbed.

When Ryunosuke is about to be killed by a villain who wants the pendant, he is saved by a beautiful Chinese girl, Sara...?!

Also contains the pre-serialization one-shot to Kimagure Orange Road.