The drop-off from the top two slots is sharper.

For the second month in a row, Black Panther graphic novels dominate the March superheroes chart, taking up seven of the 20 slots.

The Superhero chart is extremely top-heavy, with the number two book selling less than half as many units as the top seller.

These are estimates of the sales on graphic novels by Diamond U.S. to comic specialty stores during March 2018.

The biggest new title was from Instagram star Mari Andrew.

Sales on the #2 graphic novel in March, from Instagram star Mari Andrew, approached sales on the latest The Walking Dead volume.

There are few items of serious interest for geek viewers coming out on disc this week, though the fourth film in the Insidious horror film franchise should be of interest to horror film fans, and the live-action adaptation of the Tokyo Ghoul manga should also please fans of the macabre, while the anime series My Hero Academia: Season 2 continues the construction of an interesting fantasy world in which super-powered individuals are common.

This chart of the ICv2 "Manga Franchises" reflects sales in all trade channels for Fall 2017.

These are estimates of the sales on graphic novels by Diamond U.S. to comic specialty stores during February 2018.

The Top 20 Superhero Graphic Novels in February show that Black Panther's domination was not only at the box office.