Tenshi Tokei

Baka descripion:

Mikami Tsubasa has been away from school due to a heart condition. On Christmas Eve he decides it’s time to start a new life and runs away from home! But before he can get far his childhood friend, Gin, gets into a serious accident. Tsubasa, in desperation, pleas for someone to help his friend. His call is answered by someone rather unexpected though, someone calling himself an “angel”…

Have fun!

Japanese raws:

chapter 17 here new
chapter 16 here
chapter 15 here
chapter 14 here
chapter 13 here
bonus here
chapter 11 here
chapter 10 here
chapter 9 here

Other names:

天使時計 エンジェル・クロック
Angel Clock