The Devil Is a Part-Timer! Vol. 16 (manga)

A SHIFT IN PRIORITIES!

Maou staves off the attack on Chiho's school, but it was all a diversion to draw him away from the Devil's Castle! With Ashiya kidnapped by Gabriel and Emilia still missing, the
Devil King and Suzuno prepare to return to Ente Isla on an undercover rescue mission. That is, assuming Maou can find someone to cover his shifts at MgRonald first!