I makes me happy to see Akame ga Kiru doing so well. It has some great characters despite being very dark.
Here are the top ten selling manga in the United States for the week of April 19-25, 2015, according to the New York Times.
1. Akame ga Kill! Volume 2 by Takahiro and Tetsuya Tashiro
2. Log Horizon Volume 1 by Mamare Touno and Kazuhiro Hara
3. Big Hero 6 Volume 1 by Haruki Ueno
4. Citrus Volume 2 by Saburouta
5. Assassination Classroom Volume 1 by Yusei Matsui
6. Attack on Titan Volume 15 by Hajime Isayama
7. Attack on Titan Volume 1 by Hajime Isayama
8. Akame ga Kill! Volume 1 by Takahiro and Tetsuya Tashiro
9. Assassination Classroom Volume 3 by Yusei Matsui
10. Assassination Classroom Volume 2 by Yusei Matsui
Source: The New York Times