Kimi dake no Devil(1998)

Kimi dake no Devil

Sango Minamino, a 16 year-old cute, hyper and somewhat reckless girl, gets rescued one day by a green-eyed boy with black wings who calls himself Kai and claims to be Sango's guardian angel... or is he a devil?

(Source: Emily's Random Shoujo Page)

Note: Includes the one shot Tennen Meruhen 100%(天然メルヘン100%); Ribon 1998-nen Aki no Bikkuri Daizoukangou.