The Devil Is a Part-Timer!, Vol. 11 (manga‪)‬

Chiho has collapsed, and Maou and company have figured out that it must be the work of an Angel. The only thing left to figure out is whether they're holed up in Tokyo Tower or the Sky Tree. When the group finally finds whoever's responsible for hurting their friend, the ultimate Maou/Alciel combo is going to paint the town red!