First graphic novel for high school students

I teach a high school graphic novel course and I want to add a "summer reading" title. For most students, this will be the first graphic novel they read.

I already teach:

• Understanding Comics by Scott McCloud

• Maus by Art Spiegelman

• American Born Chinese by Gene Luen Yang

• Persepolis by Marjane Satrapi

What graphic novel would you suggest as a great entry point into the genre for students that have very limited background?

Edit: added "high school"