Good Night! Angel

is a japanese 4-koma manga series written by Hiiragi Yutaka. It began serialisation in the special edition Vol.1 of Manga Time Kirara Miracle before the March 2012 issue.

The series was released under 3 volumes from July 2012 to January 2014.

Synopsis
Yuri Sakaigawa, a first-year high school student, is a shy and clumsy girl with no friends. But she was a professional hitman, a genius hit girl! While dreaming of an ordinary high school girl, a new heroine who is a little disappointing with CUTE and COOL, who will give a hammer of justice to evil tonight, is born here !!

(Source: Bookwalker JP - Translated)