Gokuaku Bambina!

From [MangaHelpers](https://www.mangaupdates.com/groups.html?id=1011): Nina Shirosaki is the daughter of a mafia family. She's determined to become a hitman, but she's so kind and gentle that she has trouble even killing an insect. Now she's on her way to Japan with her father, on mafia business. She begins to attend the local high school, hoping to build her way up to being a hitman by becoming the evil boss of the school. Unfortunately, she soon makes friends with the daughter of a police chief! Will Nina ever succeed in doing something mean, giving her hope for her chances of becoming a hitman? [tethysdust]