"Raku's crush, Kosaki Onodera, has a younger sister--Haru. She's determined to protect Kosaki from what she perceives to be Raku's playboy ways. Meanwhile, assassin Paula joins Haru's class with a secret mission in mind--to set up Raku with fellow assassin Tsugumi"--Amazon.com.

"First published in Japan in 2011 by Shueisha Inc., Tokyo." Manga format; reads from back to front, right to left.